Answers
Answer: D. 25
Step-by-step explanation:
Answer:
the answer is 25
Step-by-step explanation:
Related Questions
Sam the snail crawls at a rate of 2. 64 ft. /minute. What is Sam’s rate in miles per hour? State your answer to the nearest hundredth. (1 miles = 5280 feeet)
Answers
Sam the snail's rate is approximately 0.03 miles per hour.
To find Sam's rate in miles per hour, we need to convert his speed from feet per minute to miles per hour.
We know that 1 mile is equal to 5280 feet. First, we can convert Sam's speed from feet per minute to feet per hour by multiplying it by 60 since there are 60 minutes in an hour.
Therefore, Sam's speed in feet per hour is 2.64 ft/min * 60 min/hr = 158.4 ft/hr.
Next, we can convert Sam's speed from feet per hour to miles per hour. Since 1 mile is equal to 5280 feet, we can divide Sam's speed in feet per hour by 5280 to get his speed in miles per hour.
Therefore, Sam's speed in miles per hour is 158.4 ft/hr / 5280 ft/mi = 0.03 mi/hr.
Therefore, Sam the snail crawls at a rate of approximately 0.03 miles per hour.
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If the average value of the function f on the interval 1≤x≤4 is 8, what is the value of ∫41(3f(x) 2x)dx ?
Answers
According to question the value of ∫41(3f(x) 2x)dx is 73.
We know that the average value of the function f on the interval [1,4] is 8. This means that:
(1/3) * ∫1^4 f(x) dx = 8
Multiplying both sides by 3, we get:
∫1^4 f(x) dx = 24
Now, we need to find the value of ∫4^1 (3f(x) 2x) dx. We can simplify this expression as follows:
∫1^4 (3f(x) 2x) dx = 3 * ∫1^4 f(x) dx + 2 * ∫1^4 x dx
Using the average value of f, we can substitute the first integral with 24:
∫1^4 (3f(x) 2x) dx = 3 * 24 + 2 * ∫1^4 x dx
Evaluating the second integral, we get:
∫1^4 x dx = [x^2/2]1^4 = 8.5
Substituting this value back into the equation, we get:
∫1^4 (3f(x) 2x) dx = 3 * 24 + 2 * 8.5 = 73
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2. LetA=\begin{bmatrix} a &b \\ c & d \end{bmatrix}(a) Prove that A is diagonalizable if (a-d)2 + 4bc > 0 and is not diagonalizable if (a-d)2 + 4bc < 0.(b) Find two examples to demonstrate that if (a-d)2 + 4bc = 0, then A may or may not be diagonalizble.
Answers
We can find the eigenvalues of [tex]$A$[/tex] using the characteristic equation:
[tex]$$\det(A-\lambda I) = \begin{vmatrix} a-\lambda & b \\ c & d-\lambda \end{vmatrix} = (a-\lambda)(d-\lambda) - bc = \lambda^2 - (a+d)\lambda + (ad-bc)$$[/tex]
The discriminant of this quadratic equation is:
[tex]$$(a+d)^2 - 4(ad-bc) = (a-d)^2 + 4bc$$[/tex]
Therefore, [tex]$A$[/tex] is diagonalizable if and only if [tex]$(a-d)^2 + 4bc > 0$[/tex].
If [tex]$(a-d)^2 + 4bc > 0$[/tex], then the discriminant is positive, and the characteristic equation has two distinct real eigenvalues. Since [tex]$A$[/tex] has two linearly independent eigenvectors, it is diagonalizable.
If [tex]$(a-d)^2 + 4bc < 0$[/tex], then the discriminant is negative, and the characteristic equation has two complex conjugate eigenvalues. In this case, [tex]$A$[/tex] does not have two linearly independent eigenvectors, and so it is not diagonalizable.
(b) If [tex]$(a-d)^2 + 4bc = 0$[/tex], then the discriminant of the characteristic equation is zero, and the eigenvalues are equal. We can find two examples to demonstrate that [tex]$A$[/tex] may or may not be diagonalizable in this case.
Example 1: Consider the matrix [tex]$A = \begin{bmatrix} 1 & 2 \\ 2 & 4 \end{bmatrix}$[/tex]. We have [tex]$(a-d)^2 + 4bc = (1-4)^2 + 4(2)(2) = 0$[/tex], so the eigenvalues of [tex]$A$[/tex] are both [tex]$\lambda = 2$[/tex]. The eigenvectors are [tex]$\begin{bmatrix} 1 \\ 1 \end{bmatrix}$[/tex] and [tex]$\begin{bmatrix} -2 \\ 1 \end{bmatrix}$[/tex], respectively. Since these eigenvectors are linearly independent, [tex]$A$[/tex] is diagonalizable.
Example 2: Consider the matrix [tex]$A = \begin{bmatrix} 1 & 1 \\ -1 & -1 \end{bmatrix}$[/tex]. We have [tex]$(a-d)^2 + 4bc = (1+1)^2 + 4(-1)(-1) = 0$[/tex], so the eigenvalues of[tex]$A$[/tex] are both [tex]$\lambda = 0$[/tex]. The eigenvector is[tex]$\begin{bmatrix} 1 \\ -1 \end{bmatrix}$[/tex], which is the only eigenvector of [tex]A$. Since $A$[/tex] has only one linearly independent eigenvector, it is not diagonalizable.
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Suppose you walk 18. 2 m straight west and then 27. 8 m straight north. What vector angle describes your
direction from the forward direction (east)?
Add your answer
Answers
Given that a person walks 18.2 m straight towards the west and then 27.8 m straight towards the north, to find the vector angle which describes the person's direction from the forward direction (east).
We know that vector angle is the angle which the vector makes with the positive direction of the x-axis (East).
Therefore, the vector angle which describes the person's direction from the forward direction (east) can be calculated as follows:
Step 1: Calculate the resultant [tex]vectorR = √(18.2² + 27.8²)R = √(331.24)R = 18.185 m ([/tex]rounded to 3 decimal places)
Step 2: Calculate the angleθ = tan⁻¹ (opposite/adjacent)where,opposite side is 18.2 mandadjacent side is [tex]27.8 mθ = tan⁻¹ (18.2/27.8)θ = 35.44°[/tex] (rounded to 2 decimal places)Thus, the vector angle which describes the person's direction from the forward direction (east) is 35.44° (rounded to 2 decimal places).
Hence, the correct option is 35.44°.
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Which expression is equivalent [a^8]^4
a^2
a^4
a^12
a^32
Answers
Answer:
a³²
Step-by-step explanation:
the law of exponents states that when raising a power to another power multiply the exponents
our answer will go like this:
(a⁸)⁴
a⁸*⁴
a³²
If K = -1, which Dilation would it be?
A - Enlargement
B - Reduction
C - Congruence Transformation
Answers
If K = -1, the dilation would be a reduction. Dilation is a geometric transformation that either enlarges or reduces the size of an object. Which can be positive or negative.
When the scale factor, K, is positive, the dilation is an enlargement. This means that the image of the object is larger than the original. The positive scale factor indicates that the object is being stretched or magnified.
However, when the scale factor, K, is negative, the dilation is a reduction. In this case, the image of the object is smaller than the original. The negative scale factor indicates that the object is being compressed or diminished.
Therefore, if K = -1, it signifies that the dilation is a reduction. The object will be transformed into a smaller version of itself. It is important to note that the absolute value of the scale factor determines the magnitude of the reduction, with a larger absolute value resulting in a greater reduction in size.
In summary, if K = -1, the dilation is a reduction of the object.
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1. if a is an n × n matrix and x is a vector in rn, then the product ax is a linear combination of the columns of matrix a. True or false?
Answers
A matrix is a rectangular array of numbers, symbols, or expressions arranged in rows and columns. It can be used to represent systems of linear equations, transformations in geometry, and a wide range of other mathematical concepts in a compact and organized form.
When you multiply a matrix A (n × n) by a vector x (in R^n), the resulting product Ax is a linear combination of the columns of matrix A.
Here's a step-by-step explanation:
1. Let A be an n × n matrix with columns C₁, C₂, ..., Cₙ, and x be a vector in R^n with elements [x₁, x₂, ..., xₙ]^T (transpose).
2. When you multiply the matrix A by the vector x, the resulting vector Ax can be represented as:
Ax = A * x = [C₁ C₂ ... Cₙ] * [x₁, x₂, ..., xₙ]^T
3. The multiplication of A and x results in a new vector, where each element is formed by taking the dot product of the corresponding row of A with the vector x:
Ax = [x₁*C₁ + x₂*C₂ + ... + xₙ*Cₙ]
4. In the resulting vector Ax, you can see that each column of matrix A is multiplied by its corresponding scalar from the vector x, forming a linear combination of the columns of matrix A.
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The plants in Tara's garden have a 6-foot x 10-foot area in which to grow. The garden is bordered by a brick walkway of width w.
Part A: Write two equivalent expressions to describe the perimeter of Tara's garden, including the walkway.
Part B: How can you check to see if your two expressions from Part A are equivalent?
Part C: What is the total perimeter of Tara's garden including the walkway if the walkway is 2.5ft wide?
Answers
The total perimeter of the garden is 42ft if the walkway is 2.5ft wide.
Part A:Two equivalent expressions to describe the perimeter of Tara's garden including the walkway are:
2(6 + w) + 2(10 + w) = 24 + 4w, where w is the width of the walkway.
The 2(6 + w) accounts for the two lengths of the rectangle, and 2(10 + w) accounts for the two widths of the rectangle. Simplify the expression to 4w + 24 to give the total perimeter of the garden. The other expression is:
20 + 2w + 2w + 12 = 2w + 32
Part B:To check the equivalence of the two expressions from Part A, we could simplify both expressions, as shown below.2(6 + w) + 2(10 + w) = 24 + 4w.
Simplifying the expression will yield:2(6 + w) + 2(10 + w)
= 2(6) + 2(10) + 4w2(6 + w) + 2(10 + w)
= 32 + 4w2(6 + w) + 2(10 + w)
= 4(w + 8)
Similarly, we can simplify 20 + 2w + 2w + 12 = 2w + 32, which yields:20 + 2w + 2w + 12 = 4w + 32
Part C:If the walkway is 2.5ft wide, the total perimeter of Tara's garden, including the walkway, is:
2(6 + 2.5) + 2(10 + 2.5)
= 2(8.5) + 2(12.5)
= 17 + 25
= 42ft.
We can find two equivalent expressions to describe the perimeter of Tara's garden, including the walkway. We can use the expression 2(6 + w) + 2(10 + w) and simplify it to 4w + 24.
The other expression can be obtained by adding the length of all four sides of the garden. We can check the equivalence of both expressions by simplifying each expression and verifying if they are equal.
We can calculate the total perimeter of Tara's garden, including the walkway, by using the formula 2(6 + 2.5) + 2(10 + 2.5), which gives us 42ft as the answer.
Thus, the conclusion is that the total perimeter of the garden is 42ft if the walkway is 2.5ft wide.
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When Tom plays darts, he hits the
target 65% of the time. Find the
probability that he hits the target at
least four out of next six attempts.
A. 57.17%
B. 64.71%
C.42.83%
D. 35.29%
Answers
Option A is correct, 57.17% is the probability that he hits the target at least four out of next six attempts.
Let's calculate the probability of hitting the target exactly four times out of six attempts:
P(4 hits) = C(6, 4) × (0.65)⁴ × (1 - 0.65)⁶⁻⁴
The probability of hitting the target exactly five times out of six attempts:
P(5 hits) = C(6, 5) × (0.65)⁵ × (1 - 0.65)⁶⁻⁵
Now calculate the probability of hitting the target all six times:
P(6 hits) = (0.65)⁶
Now, we can find the probability that Tom hits the target at least four times by summing up the individual probabilities:
P(at least 4 hits) = P(4 hits) + P(5 hits) + P(6 hits)
P(at least 4 hits) = C(6, 4) × (0.65)⁴ × (1 - 0.65)⁶⁻⁴ + C(6, 5) × (0.65)⁵ × (1 - 0.65)⁶⁻⁵ + (0.65)⁶
=57.17%
Hence, 57.17% is the probability that he hits the target at least four out of next six attempts.
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Complete each question. Make sure to show work whenever possible.
1. Find the value of x.
Answers
The value of x in the figure of similar triangles is
13.5
What are similar triangles?This is a term used in geometry to mean that the respective sides of the triangles are proportional and the corresponding angles of the triangles are congruent
Examining the figure shows that pair of proportional sides are
22 and 11, then 27 and x
The solution is worked out below
22 / 11 = 27 / x
22x =11 * 27
x = 11 * 27 / 22
x = 13.5
hence side x = 13.5
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Express x²-8x+5 in form of (x-a)^2 -b
Answers
Answer:
a=4, b=11
Step-by-step explanation:
You have to complete the square.
x²-8x+5 = (x-4)²-16 +5 = (x-4)² - 11
Use the Ratio Test to determine whether the series is convergent or divergent.
[infinity] n
6n
n = 1
Identify
an.
Evaluate the following limit.
lim n → [infinity]
an + 1
an
Answers
the series ∑(n=1 to infinity) [tex]n^{6}[/tex] / n! is convergent by using ratio test.
To apply the Ratio Test, we need to evaluate the limit of the ratio of consecutive terms, lim(n→∞) (a(n+1) / a(n)).
In this case, a(n) = [tex]n^{6}[/tex] / n! and a(n+1) =[tex](n+1)^{6}[/tex] / (n+1)!.
Taking the limit, we have:
lim(n→∞) [[tex](n+1)^{6}[/tex] / (n+1)!] / [[tex]n^{6}[/tex] / n!]
= lim(n→∞) [[tex](n+1)^{6}[/tex] / [tex]n^{6}[/tex]] * [n! / (n+1)!]
= lim(n→∞) [[tex](n+1)^{6}[/tex] / [tex]n^{6}[/tex]] * [1 / (n+1)]
= 1 * 0 = 0.
Since the limit of the ratio of consecutive terms is 0, which is less than 1, the series converges by the Ratio Test.
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Sanjay’s closet is shaped like a rectangular prism. It measures feet high and has a base that measures feet long and feet wide. What is the volume of Sanjay’s closet?
Answers
The volume of Sanjay’s closet would be 82.875 ft³
It is known that a rectangular prism is a three-dimensional shape that has two at the top and bottom and four are lateral faces.
The volume of a rectangular prism=Length X Width X Height
Given parameters are;
4 1/4 ft long, 3 1/4 ft wide, and 6 ft tall.
V = Length X Width X Height
V = 3 1/4 x 4 1/4 x 6
V = 82. 7/8 ft³ or 82.875 ft³
The complete question is
Sanjay’s closet is shaped like a rectangular prism. It measures 4 1/4 ft long, 3 1/4 ft wide, and 6 ft tall. What is the volume of Sanjay’s closet?
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Evaluate the integral. integral_0^1 (x^17 + 17^x) dx x^18/18 + 17^x/log(17)
Answers
The value of the given integral is (1/18) + (17/ln(17)).
The integral is evaluated using the sum rule of integration, which states that the integral of the sum of two functions is equal to the sum of their integrals. Therefore, we can evaluate the integral of each term separately and then add them together.
For the first term, we use the power rule of integration, which states that the integral of [tex]x^n[/tex]is equal to[tex](x^(n+1))/(n+1)[/tex]. Therefore, the integral of [tex]x^17[/tex]is [tex](x^18)/18.[/tex]
For the second term, we use the exponential rule of integration, which states that the integral of [tex]a^x[/tex]is equal to [tex](a^x)/(ln(a))[/tex]. Therefore, the integral of [tex]17^x is (17^x)/(ln(17)).[/tex]
Adding these two integrals together gives us the final answer of (1/18) + [tex](17/ln(17)[/tex]).
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Determine whether the geometric series is convergent or divergent. 10 - 6 + 18/5 - 54/25 + . . .a. convergentb. divergent
Answers
After applying the ratio test to the given geometric series, the answer is option a: the series is convergent.
Is the given geometric series convergent or divergent?The given series is: 10 - 6 + 18/5 - 54/25 + ...
To determine whether this series is convergent or divergent, we can use the ratio test.
The ratio test states that a series of the form ∑aₙ is convergent if the limit of the absolute value of the ratio of successive terms is less than 1, and divergent if the limit is greater than 1. If the limit is equal to 1, then the ratio test is inconclusive.
So, let's apply the ratio test to our series:
|ax₊₁ / ax| = |(18/5) * (-25/54)| = 15/20.24 ≈ 0.74
As the limit of the absolute value of the ratio of successive terms is less than 1, we can conclude that the series is convergent.
Therefore, the answer is (a) convergent.
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Calculate the net force these forces acts on a single object, 30n up 25n down 5n down 5n up
Answers
The net force acting on the object is 10N up
When multiple forces act on an object, the net force is the total force acting on the object. It determines the object's motion, including its direction and speed.
To calculate the net force, we need to add all the forces acting on the object. If the net force is zero, the object will remain at rest or move with a constant velocity, while if it is non-zero, the object's velocity will change, and it will accelerate in the direction of the net force.
In this scenario, there are four forces acting on the object, two pointing up and two pointing down. To calculate the net force, we need to add all the forces together, taking into account their direction and magnitude.
Since the forces pointing up and down are opposite in direction, we subtract the smaller force from the larger one to get the resultant force. In other words, we can cancel out the forces pointing in opposite directions, leaving us with a single net force acting on the object.
So, in this case, we have a 30N force pointing up, a 25N force pointing down, a 5N force pointing down, and a 5N force pointing up.
First, we'll cancel out the 5N force pointing down with the 5N force pointing up.
30N up - 25N down - 5N down + 5N up
= 30N - 25N - 5N + 5N
= 30N - 20N
= 10N up
Therefore, the net force acting on the object is 10N up. This means that the object will accelerate in the upward direction with a force of 10N
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Complete Question
Calculate the net force these forces acts on a single object, 30N [up],
25N [down], 5N [down] and 5N [up]
a sample has a mean of m = 86. if one new person is added to the sample, and σx is unchanged, what effect will the addition have on the sample mean?
Answers
As σx (standard deviation) remains unchanged, the value of x alone cannot determine the effect on sample mean. It depends on the value of x relative to the values in original sample and sample size.
If one new person is added to the sample and the standard deviation (σx) remains unchanged, the effect on the sample mean (m) can be determined as follows:
Let's denote the original sample size as n and the sum of the sample values as Σx.
Original sample mean:
m = Σx / n
After adding the new person, the new sample size becomes n + 1, and the sum of the sample values becomes Σx + x_new (x_new represents the value of the new person).
New sample mean:
m' = (Σx + x_new) / (n + 1)
To analyze the effect, we can express the difference in means:
Δm = m' - m = ((Σx + x_new) / (n + 1)) - (Σx / n)
Simplifying this expression, we get:
Δm = (x_new - (Σx / n)) / (n + 1)
Therefore, the effect of adding the new person on the sample mean (m) is determined by the difference between the value of the new person (x_new) and the original mean (Σx / n), divided by the increased sample size (n + 1).
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y′′ 2y′ y = f(t), y(0) = 0, y′(0) = 1, where f(t) = { 0 0 ≤t < 3 2 3 ≤t <10, f(t) = 0,t > 10
Answers
The solution to the given differential equation is y(t) = te^t + 1/2 for 3 ≤ t < 10, and y(t) = c1 e^t + c2 t e^t for t < 3 and t ≥ 10.Note that the constants c1 and c2 in the last expression can be determined using the continuity of y(t) and y′(t) at t = 3 and t = 10.
To solve the given differential equation, we first find the general solution to the homogeneous equation y′′ - 2y′ + y = 0. The characteristic equation is r^2 - 2r + 1 = 0, which has a double root of r = 1. Therefore, the general solution to the homogeneous equation is y_h(t) = (c1 + c2 t)e^t.
Next, we find a particular solution to the non-homogeneous equation. Since f(t) is piecewise defined, we consider two cases:
Case 1: 0 ≤ t < 3. In this case, f(t) = 0, so the non-homogeneous equation becomes y′′ - 2y′ + y = 0. We already have the general solution to this equation, so the particular solution is y_p(t) = 0.
Case 2: 3 ≤ t < 10. In this case, f(t) = 2, so the non-homogeneous equation becomes y′′ - 2y′ + y = 2. We try a particular solution of the form y_p(t) = At + B. Substituting this into the equation gives A = 0 and B = 1/2. Therefore, the particular solution in this case is y_p(t) = 1/2.
Case 3: t ≥ 10. In this case, f(t) = 0, so the non-homogeneous equation becomes y′′ - 2y′ + y = 0. We already have the general solution to this equation, so the particular solution is y_p(t) = 0.
The general solution to the non-homogeneous equation is y(t) = y_h(t) + y_p(t) = (c1 + c2 t)e^t + 1/2 for 3 ≤ t < 10, and y(t) = (c1 + c2 t)e^t for t < 3 and t ≥ 10.Using the initial conditions, we have y(0) = 0, which implies that c1 = 0. Also, y′(0) = 1, which implies that c2 = 1.
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Test the series for convergence or divergence. Σ (n^9 +1) / (n10 + 1) n = 1 a. convergent b. divergent
Answers
The given series is divergent.
We can use the limit comparison test to determine the convergence or divergence of the given series:
First, note that for all n ≥ 1, we have: [tex]\frac{(n^9 + 1) }{ (n^10 + 1)}[/tex] ≤ [tex]\frac{n^9 }{n^10} = \frac{1}{n}[/tex]
Therefore, we can compare the given series to the harmonic series ∑ 1/n, which is a well-known divergent series. Specifically, we can apply the limit comparison test with the general term [tex]a_n = \frac{(n^9 + 1)}{(n^{10} + 1)}[/tex] and the corresponding term [tex]b_n = \frac{1}{n}[/tex]:
lim (n → ∞) [tex]\frac{a_n }{ b_n}[/tex] = lim (n → ∞) [tex]\frac{\frac{(n^9 + 1)}{(n^10 + 1)} }{\frac{1}{n} }[/tex]
= lim (n → ∞) [tex]\frac{ n^{10} }{ (n^9 + 1)}[/tex]
= lim (n → ∞) [tex]\frac{n}{1+\frac{1}{n^{9} } }[/tex]
= ∞
Since the limit is positive and finite, the series ∑ [tex]\frac{(n^9 + 1) }{ (n^10 + 1) }[/tex] behaves in the same way as the harmonic series, which is divergent. Therefore, the given series is also divergent.
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For the sequence an=(5+3n)^−3. Find a number k such that n^ka_n has a finite non-zero limit.
Answers
Answer:
n^3*a_n ≈ (1/27) * n^3 → non-zero limit
Step-by-step explanation:
We have the sequence given by a_n = (5+3n)^(-3), and we want to find a value of k such that n^k*a_n has a finite non-zero limit as n approaches infinity.
Let's simplify the expression n^k*a_n:
n^k*a_n = n^k*(5+3n)^(-3)
We can rewrite this as:
n^k*a_n = [n/(5+3n)]^3 * [1/(n^(-k))]
Using the fact that 1/(n^(-k)) = n^k, we can further simplify this to:
n^k*a_n = [n/(5+3n)]^3 * n^k
We want this expression to have a finite non-zero limit as n approaches infinity. For this to be true, we need the first factor, [n/(5+3n)]^3, to approach a finite non-zero constant as n approaches infinity.
To see why this is the case, note that as n gets large, the 3n term dominates the denominator and we have:
[n/(5+3n)]^3 ≈ [n/(3n)]^3 = (1/27) * n^(-3)
So we need k = 3 for n^k*a_n to have a finite non-zero limit. Specifically, as n approaches infinity, we have:
n^3*a_n ≈ (1/27) * n^3 → non-zero constant.
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What is the surface area of a square-based pyramid with a base length of 3 in, height of 7 in, and a slant height of 5 in?
Answers
Answer:
Surface area of a square pyramid = a 2 + 2al Where, a denotes base length of a square pyramid and, l denotes the slant height or the height of each side face.
Step-by-step explanation:
I used to do stuff like this but I haven't in a long time so I believe you have to add up all the numbers or multiply them.
What is the equation of a line perpendicular to 4x+3y=15 that goes through the point (5,2)?
Answers
Answer:
y = (3/4)x - 7/4
Step-by-step explanation:
y – y1 = m (x – x1), where y1 and x1 are the coordinates of a given point.
4x + 3y = 15
3y = -4x + 15
y = -(4/3)x + 5.
the slope of this line is -4/3.
the slope of the perpendicular line is -1 / (-4/3) = +3/4.
equation of perpendicular line through (5, 2) is:
y - 2 = (3/4) (x -5) = (3/4)x - (15/4)
y = (3/4)x - (15/4) + 2
y = (3/4)x - 7/4
sketch the region enclosed by the given curves. y = 2 x , y = 8x, y = 1 8 x, x > 0
Answers
The sketched region enclosed by the given curves, y = 2/x, y = 8x, and y = x/8 is given below.
To sketch the region enclosed by the given curves, we'll first plot each curve separately and then identify the region between them. The curves are:
y = 2/x
y = 8x
y = x/8
Let's start by plotting these curves one by one:
y = 2/x:
Since x > 0, the curve y = 2/x is a hyperbola with the y-axis as an asymptote and passes through the point (1, 2).
y = 8x:
This is a straight line passing through the origin (0, 0) with a slope of 8. The line goes through the first quadrant.
y = x/8:
This is another straight line with a slope of 1/8. It passes through the origin (0, 0) and also goes through the first quadrant.
Therefore, the final graph is given below.
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The complete question:
Sketch the region enclosed by the given curves.
y = 2/x, y = 8x, y = x/8, x>0
Using the same context as the previous problem - A toy race car is racing on a circular track and the car is 4 feet from the center of the racetrack. After only traveling around 80% of the track, the motor in the car stopped working and the toy race car was stuck. a. How far along the track (in feet) did the toy race car travel before stopping? b. How many radians did the toy race car sweep out from its starting position to when it stopped working? c. How far is the toy race car to the right of the center of the track (in feet) when it traveled 80% of the track? d. If the toy race car travels an additional 2radians from where it stopped working on the track how far will the toy race car be to the right of the center of the track? e. If the toy race car travels an additional 4T radians from where it stopped working on the track how far will the toy race car be to the right of the center of the track?
Answers
a) The toy race car traveled 20.106 feet before stopping.
b) The toy race car swept out approximately 1.6π radians from its starting position to when it stopped working.
c) The toy race car is 4 feet to the left of the center of the track when it traveled 80% of the track.
d) The toy race car will be approximately 1.236 feet to the right of the center of the track.
e) The toy race car will be at x = 4 cos(4T + 1.6π) + 2.55 to the right of the center of the track.
a. To find how far along the track the toy race car traveled before stopping, we can simply multiply the circumference of the circular track by 0.8, since the car traveled 80% of the track before stopping.
Circumference = 2πr
= 2π(4) (since the car is 4 feet from the center of the track)
= 8π feet
Distance traveled = 0.8 × 8π
= 6.4π feet
= 20.106 feet (rounded to three decimal places)
Therefore, the toy race car traveled 20.106 feet before stopping.
b. To find how many radians the toy race car swept out from its starting position to when it stopped working, we can use the formula:
θ = s/r
where θ is the angle in radians, s is the distance traveled along the arc, and r is the radius of the circle.
We know that the distance traveled along the arc is 0.8 times the circumference of the circle, which we calculated to be 8π feet. The radius of the circle is 4 feet. Therefore:
θ = (0.8 × 8π) / 4
= 1.6π radians
= 5.026 radians (rounded to three decimal places)
Therefore, the toy race car swept out 5.026 radians from its starting position to when it stopped working.
c. To find how far the toy race car is to the right of the center of the track when it traveled 80% of the track, we need to find the horizontal displacement of the toy race car at that point. Since the toy race car is traveling on a circular track, we can use trigonometry to find its horizontal displacement.
The distance traveled by the toy race car along the track is 80% of the circumference of the circle, which is:
circumference = 2πr = 2π(4) = 8π feet
distance traveled = 0.8 × 8π = 6.4π feet
This distance corresponds to an angle of:
angle = distance traveled / radius = 6.4π / 4 = 1.6π radians
Using this angle, we can find the horizontal displacement using cosine:
cos(1.6π) = -1
Therefore, the toy race car is 4 feet to the left of the center of the track when it traveled 80% of the track.
d. To find how far the toy race car will be to the right of the center of the track if it travels an additional 2 radians from where it stopped working, we can use the same trigonometric approach as in part c. We know that the radius is 4 feet and the toy race car will sweep out an additional angle of 2 radians, so its horizontal displacement will be:
cos(1.6π + 2) = -cos(0.4π) = -0.309
Therefore, the toy race car will be approximately 1.236 feet to the right of the center of the track.
e. If the toy race car travels an additional 4T radians from where it stopped working on the track, we can use the same approach as in part d. The position of the toy race car is given by:
x = r cos(θ) + d
where θ = 4T and d is the distance from the center of the track (found in part c). Plugging in the values, we get:
x = 4 cos(4T + 1.6π) + 2.55
Note that the value of x will depend on the value of T, which is not given in the problem.
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Reparametrize the curve with respect to arc length measured from the point where t = 0 in the direction of increasing t. (Enter your answer in terms of s.) r(t) = e4t cos 4t i + 3 j + e4t sin 4t k
Answers
The Reparametrized curve with respect to arc length is:
r(s) = (1/2) * sqrt(2) * e^(4t) cos(4t) i + 3 j + (1/2) * sqrt(2) * e^(4t) sin(4t) k
To reparametrize the curve with respect to arc length, we need to find the expression for the curve in terms of the arc length parameter s.
The arc length parameter s is given by the integral of the speed function |r'(t)| with respect to t:
s = ∫|r'(t)| dt
Let's calculate the speed function |r'(t)| first:
r(t) = e^(4t) cos(4t) i + 3 j + e^(4t) sin(4t) k
r'(t) = (4e^(4t) cos(4t) - 4e^(4t) sin(4t)) i + 0 j + (4e^(4t) sin(4t) + 4e^(4t) cos(4t)) k
|r'(t)| = sqrt((4e^(4t) cos(4t) - 4e^(4t) sin(4t))^2 + (4e^(4t) sin(4t) + 4e^(4t) cos(4t))^2)
= sqrt(16e^(8t) cos^2(4t) - 32e^(8t) cos(4t) sin(4t) + 16e^(8t) sin^2(4t) + 16e^(8t) sin^2(4t) + 32e^(8t) cos(4t) sin(4t) + 16e^(8t) cos^2(4t))
= sqrt(32e^(8t))
Now, we can express s in terms of t by integrating |r'(t)|:
s = ∫sqrt(32e^(8t)) dt
To find the integral, we can make a substitution u = 8t, du = 8 dt:
s = (1/8) ∫sqrt(32e^u) du
= (1/8) ∫2sqrt(2e^u) du
= (1/8) * 2 * sqrt(2) ∫e^(u/2) du
= (1/4) * sqrt(2) * ∫e^(u/2) du
= (1/4) * sqrt(2) * 2e^(u/2) + C
= (1/2) * sqrt(2) * e^(4t) + C
Therefore, the reparametrized curve with respect to arc length is:
r(s) = (1/2) * sqrt(2) * e^(4t) cos(4t) i + 3 j + (1/2) * sqrt(2) * e^(4t) sin(4t) k
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The curve reparametrized with respect to arc length is:
r(u) = e^(2u/√2) cos(2u/√2) i + 3j + e^(2u/√2) sin(2u/√2) k
We have the curve given by:
r(t) = e^(4t) cos(4t) i + 3j + e^(4t) sin(4t) k
The speed of the curve is:
|v(t)| = √( (dx/dt)^2 + (dy/dt)^2 + (dz/dt)^2 )
= √( 16e^(8t) + 16e^(8t) )
= 4e^(4t) √2
Thus, the arc length from t = 0 to t = s is:
s = ∫0s |v(t)| dt
= ∫0s 4e^(4t) √2 dt
= √2 e^(4t) |_0^s
= √2 ( e^(4s) - 1 )
Solving for s, we get:
s = (1/4) ln( (s/√2) + 1 )
Let u be the parameter with respect to arc length, then we have:
u = ∫0t |v(t)| dt
= ∫0t 4e^(4t) √2 dt
= √2 e^(4t) |_0^t
= √2 ( e^(4t) - 1 )
Solving for t, we get:
t = (1/4) ln( (u/√2) + 1 )
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Solve the simultaneous equations
x^2 +y^2 =9
X+y=2
Answers
The given simultaneous equations are x² + y² = 9 ...............(1)
x + y = 2 ...............(2)
Equation (2) is solved for y by taking x as the subject:
y = 2 - x
Substitute this value of y in the equation (1):
x² + y² = 9x² + (2 - x)² = 9x² + 4 - 4x + x² = 9
Rearrange the above equation in the standard quadratic form by bringing all terms to one side of the equation:
x² + x² - 4x - 5 = 02
x² - 4x - 5 = 0
This equation is a quadratic equation and can be solved by using the quadratic formula:
x = [-(-4) ± √(-4)² - 4(2)(-5)]/2(2)
x = [4 ± √56]/4
x = [4 ± 2√14]/4
x = [2 ± √14]/2
Substitute these values of x in equation (2) to find the corresponding values of y:
For x = [2 + √14]/2,
y = 2 - [2 + √14]/2
y = (4 - [2 + √14])/2
y = (2 - √14)/2
For x = [2 - √14]/2,
y = 2 - [2 - √14]/2
y = (4 - [2 - √14])/2
y = (2 + √14)/2
Therefore, the solution of the given simultaneous equations is
x = [2 + √14]/2,
y = (2 - √14)/2
OR
x = [2 - √14]/2,
y = (2 + √14)/2
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Just having a rough time with this please help. Thank you
Answers
Answer:
The formatting is a bit off but assuming that -x + 2y = 6 and -3x + y = -2 are the two separate equations, the solution to your system of equations is (2,4) or x = 2, y = 4.
Step-by-step explanation:
Here is how you could solve this system of equations using the elimination method:
1. The first step is to find a variable you can eliminate, such as y.
-x+2y=6
-3x+y=-2
(multiply the second equation by -2)
−x+2y=6
6x-2y=4
This is your new set
2. Next, "add" your set together by lining it up and combining like terms.
-x+2y=6
+. 6x-2y=4
——————
5x = 10
3. Solve for x by dividing by 5
5x=10
10÷5=2
x=2
4. Now that you have your x, find y by substituting 2 for x in any of your original set's equations. We'll do the first equation, −x+2y=6.
−x+2y=6
-2+2y=6 ---> add 2 on both sides to remove -2
2y=8 ---> divide by 2 on both sides to remove the 2 from y
y=4
5. Set your answers up as an ordered pair like this ( ___ , ___ )
x=2 , y=4
(2, 4)
Hope this helps!
a lawn roller in the shape of a right circular cylinder has a diameter of 18in and a length of 4 ft find the area rolled during onle complete relvutitopn of the roller
Answers
During one complete revolution, the lawn roller covers approximately 2713.72 square inches of area.
A lawn roller in the shape of a right circular cylinder has a diameter of 18 inches and a length of 4 feet.
To find the area rolled during one complete revolution of the roller, we need to calculate the lateral surface area of the cylinder.
First, let's convert the length to inches: 4 feet = 48 inches.
The formula for the lateral surface area of a cylinder is 2πrh, where r is the radius and h is the height (length).
Since the diameter is 18 inches, the radius is 9 inches (18/2).
Plugging in the values, we get:
2π(9)(48) = 2π(432) ≈ 2713.72 square inches.
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I pls need the answer
Answers
The equation of the line in the graph is
y = -3/2 x + 5.How to write the equation of the line in the graphFrom the graph the line passed through points (4,-1) and (0,5)
using the slope-intercept form of a line, which is y = mx + b,
where
m is the slope and
b is the y-intercept.
the slope of the line
m = (5 - (-1)) / (0 - 4) = 6 / -4 = -3/2
form the points the y intercept is 5
Therefore, the equation of the line is y = -3/2 x + 5.
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The total weight of the raw material will not be less than 1,500 tons. The factory manager plans to use two different trucking firms. Big Red has heavy-duty trucks that can transport 200 tons at a cost of $50 per truckload. Common Joe is a more economical firm, costing only $20 per load, but its trucks can transport only 90 tons. The factory manager does not wish to spend more than $450 on transportation. The availability of trucks is the same for both firms
Answers
The total cost of transporting the raw materials is $890, which is less than the $450 budget of the factory manager.
The best way to maximize the transportation of raw materials from a factory to its storage area using Big Red and Common Joe trucking firms while ensuring the factory manager does not spend more than $450 is to use 5 Big Red trucks and 5 Common Joe trucks.In order to get the best result from the two trucking firms, the following steps should be followed.
Step 1: Determine the number of trucks that can be transported using Big Red's heavy-duty trucks.
$200 per truck is the cost of transporting 200 tons by Big Red.
The formula for calculating the number of trucks that can be used is as follows:
$450/$50 = 9 truckloads
Step 2: Determine the number of trucks that can be transported using Common Joe trucks.
$20 per truck is the cost of transporting 90 tons by Common Joe.
The formula for calculating the number of trucks that can be used is as follows:
$450/$20 = 22.5 truckloads
The number of trucks that can be used is 22, but since it is not an integer, it will be rounded down to 22.The total number of tons that can be transported using the two trucking firms is calculated as follows:
5 * 200 = 1000 tons of raw materials can be transported by Big Red
5 * 90 = 450 tons of raw materials can be transported by Common Joe
The total tons of raw materials that can be transported is therefore 1,450 tons.
Therefore, to transport a total of 1,500 tons of raw materials, 50 more tons need to be transported. 10 more truckloads of Big Red will transport these additional tons.
Therefore, 15 truckloads will be transported by Big Red (5 + 10 = 15), and the remaining 7 truckloads will be transported by Common Joe. (22 - 15 = 7).
As a result, the total cost of transporting the raw materials is:
$50 * 15 + $20 * 7 = $750 + $140
= $890, which is less than the $450 budget of the factory manager.
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