Assuming the wealthy, generous and whimsical friend chooses the k recipients uniformly at random, there are nCk ways to select the k people from the n who show up at the party.
The number of ways that you and your best friend can both receive iPhones is equal to the number of ways to select k-2 people from the remaining n-2 people, multiplied by 2 (since you can be selected first or second among the k recipients).
Therefore, the probability that you and your best friend both receive iPhones is: 2 * (n-2Ck-2) / nCk
Simplifying this expression using combinatorial identities, we get: 2 * (n-2Ck-2) / nCk = 2 * [(n-2)! / (k-2)! (n-k)!] / [n! / k! (n-k)!] = 2 * k(k-1) / n(n-1)
Thus, the probability that you and your best friend both receive iPhones is k(k-1) / n(n-1).
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When conducting a survey, which of the following is the most importantreason to avoid using a volunteer sample?
A. In order to get stronger opinions expressed.
B. Your conclusions could not be reliably generalized to a larger population.
C. You might not get a significant result.
D. To ensure truthful answers to the survey's questions.
The most important reason to avoid using a volunteer sample is Your conclusions could not be reliably generalized to a larger population.
Then, we want to determine the most important reason to avoid using a volunteering sample.
A levy sample is a slice system where people can choose whether or not they share in the check. While easier, this system can beget issues statistically.
The primary issue that this slice fashion faces is that the sample won't be arbitrary. You'll probably get people who are more opinioned about the subject the sample enterprises. This means that the sample won't truly be arbitrary, which in turn means it'll not be representative of the population. However, also the conclusions from the sample can not be generalized to the population, If the sample isn't representative of the population.
Thus, the answer is B. Your conclusions couldn't be reliably generalized to a larger population.
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Which of the following constraints are not linear or cannot be included as a constraint in a linear programming problem?
a. 2X1 + X2 − 3X3 ≥ 50b. 2X1+√X2 ≥ 60c. 4X1 - 1/3 X2 = 75d. 3X1+2X2-3x3/ X1+X2+X3 ≤ 0.9e. 3X1^2 +7X2 ≤ 45
The constraint 3X₁² + 7X₂ ≤ 45 has a degree of two and it cannot be used as constraint in a linear programming problem.
The correct answer is an option (e)
We know that a linear constraint in linear programming occurs when linear components are added or subtracted. Also the resulting expression must either increase, decrease, or be exactly equal to a right-hand side value.
Any constraint of a linear programming problem is referred to as linear if all of its terms are of the first order.
We know that the degree of the linear constraint is one, hence the constraint that does not have a degree of one is not a linear constraint.
Here we can observe that the constraint 3X₁² + 7X₂ ≤ 45 has a degree of two and it cannot be used as constraint in a linear programming problem.
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The complete question is:
Which of the following constraints are not linear or cannot be included as a constraint in a linear programming problem?
a. 2X₁ + X₂ − 3X₃ ≥ 50
b. 2X₁ + √X₂ ≥ 60
c. 4X₁ - 1/3 X₂ = 75
d. 3X₁ + 2X₂ - 3x₃ / X₁ + X₂ + X₃ ≤ 0.9
e. 3X₁² + 7X₂ ≤ 45
Hermes earns $6)an hour for babysitting. He
wants to earn at least($168) for a new video
game system. Determine the number of
hours he must babysit to earn enough money
for the video game system. Then interpret
the solution.
Answer:
Step-by-step explanation:
Just divide the amount he expects to earn between the payment for each working hour.
[tex]Hours -to-babysit=\frac{168}{6}=28[/tex]
Hermes must babysit 28 hours to earn $168 for his new videogame
Quantricide is mixed 2 fl oz to one gallon of water to give the proper dilution for disinfecting. What is the ratio of Quantricide to water?
( please help answer the other questions too below it )
The required ratio of Quantricide to water is 1 fl oz of Quantricide to 64 fl oz of water.
What is the Ratio?The ratio can be defined as the proportion of the fraction of one quantity towards others. e.g.- water in milk.
Here,
Since we are mixing 2 fl oz of Quantricide with one gallon of water, the ratio of Quantricide to water is, 2 fl oz : 1 gallon
However, it is common to express ratios in simplified form, so we can convert the units of gallons to fluid ounces to get a ratio in terms of fluid ounces,
1 gallon = 128 fl oz (since 1 gallon contains 128 fluid ounces)
So, the ratio of Quantricide to water in terms of fluid ounces is:
2 fl oz : 128 fl oz
This ratio can be simplified by dividing both sides by 2:
1 fl oz : 64 fl oz
Therefore, the ratio of Quantricide to water is 1 fl oz of Quantricide to 64 fl oz of water.
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Greg's age is 6 less than 5 times Rachel's age. In four years the sum of their ages will be 20. How old is each person now?
Answer:
Rachels age = 3 years
Greg's age = 9 years
Step-by-step explanation:
Framing algebraic equations and solving:Present age:
Let Rachels age = x years
5 time of Rachel's age = 5*x = 5x
6 less than 5x = 5x - 6
Greg's age = (5x - 6) years
Age after four years:
Rachel's age = (x + 4) years
Greg's age = 5x - 6 + 4
= ( 5x - 2) years
Sum of their ages = 20
x + 4 + 5x - 2 = 20
x + 5x + 4 - 2 = 20
Combine like terms,
6x + 2 = 20
Subtract 2 from both sides,
6x = 20 - 2
6x = 18
Divide both sides by 6,
x = 18 ÷ 6
x = 3
Rachel's age = 3 years
Greg's age = 5*3 - 6
= 15 - 6
= 9 years
The average income, I, in dollars, of a lawyer with an age of x years is modeled with the following function:
I=-425x^(2) + 45,500x-650,000
What is the youngest age for which the average income of a lawyer is $275,000
The youngest age for which the average income of a lawyer is $275,000 is 27.91 year.
Quadratic Equation helps solve quadratic equations. First, put the equation into the form ax²+bx+c=0. where a, b, and c are the coefficients. Then plug these coefficients into the equation.
(-b±√(b²-4ac))/(2a) . See examples of solving various equations using formulas
The average annual income, I, in dollars, of a lawyer with an age of x years is modeled with with the following function:
I = - 425x² + 45500x - 650000 .......... (1)
If the average annual income of the lawyer at the age of x years is $275000, then from the equation (1) we can write
- 425x² + 45500x - 650000 = 250000
I=-425x^(2) + 45,500x-650,000
275000 = -425x^(2) + 45,500x-650,000
-425x^(2) + 45,500x -650000-275000=0
425x^(2) -45,500x +925000=0
x = 900/17 ± 10√(1810)/17
= 77.96 and 27.91
here we are not accepting the ans 77.96 because we have already less value which is 27.91 so final ans will be 27.91
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LOTS OF POINTS IF U ANSWER RIGHT!!
Graph g(2) = 4 cos (2x) - 2.
Use 3.14 for pi.
Use the sine tool to graph the function. The first point must be on the midline and the second point must be a maximum or minimum value on the graph closest to the first point.
Divide (-9∠30 ) ÷ (-3∠-30)
After divide, the value of expression (-9∠30 ) ÷ (-3∠-30) is
⇒ (-9∠30 ) ÷ (-3∠-30) = 3
What is Division method?Division method is used to distributing a group of things into equal parts. Division is just opposite of multiplications. For example, dividing 20 by 2 means splitting 20 into 2 equal groups of 10.
Given that;
The expression is,
⇒ (-9∠30 ) ÷ (-3∠-30)
Now, We can divide the expression as;
⇒ (-9∠30 ) ÷ (-3∠-30)
⇒ (-9∠30 ) / (-3∠-30)
⇒ - 9/- 3
⇒ 3
Thus, After divide, the value of expression (-9∠30 ) ÷ (-3∠-30) is
⇒ (-9∠30 ) ÷ (-3∠-30) = 3
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opening a restaurant you are thinking about opening a restaurant and are searching for a good location. from research you have done, you know that the mean income of those living near the restaurant must be over $85,000 to support the type of upscale restaurant you wish to open. you decide to take a simple random sample of 50 people living near one potential location. based on the mean income of this sample, you will decide whether to open a restaurant there.8
Since we rejected the null hypothesis, you can consider opening a restaurant at that location.
What is the null hypothesis?In order to determine whether the mean income of the sample is sufficient to support the type of upscale restaurant you wish to open, we can perform a hypothesis test.
The null hypothesis (H₀) is that the mean income of the population near the potential location is $85,000 or less.
The alternative hypothesis (Ha) is that the mean income of the population near the potential location is greater than $85,000.
Using a one-sample t-test to test this hypothesis, since the population standard deviation is unknown and the sample size is relatively small (n = 50).
Let's assume that the sample mean income is $90,000 and the sample standard deviation is $10,000.
The test statistic can be calculated as:
t = (sample mean - hypothesized mean) / (sample standard deviation / √n))
t = ($90,000 - $85,000) / ($10,000 / √50))
t = 2.50
The degrees of freedom for this test are n-1 = 49. Using a significance level of 0.05 and a one-tailed test, the critical t-value is 1.676.
Since the calculated t-value (2.50) is greater than the critical t-value (1.676), we can reject the null hypothesis and conclude that there is sufficient evidence to support the claim that the mean income of the population near the potential location is greater than $85,000.
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8)
Mariah is planting a rectangular rose
garden. In the center of the garden,
she puts a smaller rectangular patch
of grass. The grass is 2 ft by 3 ft. What
is the area of the rose garden?
Rose
Garden
9ft
10ft
Patch of Grass
2ft 3ft
Answer:
Step-by-step explanation:
133 ft
Which recursive formula can be used to define this sequence for n > 1?
-3, -6, -12, -24, -48, -96, .
Answer:
The recursive formula for this sequence is y(n) = 2 * y(n-1). Starting with y(1) = -3, this formula produces the sequence of -3, -6, -12, -24, -48, and -96.
If [tex]f(x)=\frac{5x^{4}}{1-x}[/tex] then [tex]f^{4} (x)[/tex]
Note: There is a way of doing this problem without using the quotient rule 4 times.
Answer:
To find the fourth derivative of f(x), we can use the fact that f(x) can be expressed as:
f(x) = 5x^4 (1 - x)^-1
Then, using the product rule repeatedly, we can find the derivatives of f(x) up to the fourth order:
f'(x) = 20x^3 (1 - x)^-1 - 5x^4 (1 - x)^-2
f''(x) = 60x^2 (1 - x)^-1 + 40x^3 (1 - x)^-2 + 10x^4 (1 - x)^-3
f'''(x) = 120x (1 - x)^-1 + 180x^2 (1 - x)^-2 + 120x^3 (1 - x)^-3 + 20x^4 (1 - x)^-4
f^4(x) = 120 (1 - x)^-1 + 720x (1 - x)^-2 + 1080x^2 (1 - x)^-3 + 480x^3 (1 - x)^-4 + 60x^4 (1 - x)^-5
So, we have found the fourth derivative of f(x) without using the quotient rule four times.
The fourth derivative of the function f(x) = 5x⁴/(1 - x)⁻¹ is,
f''''(x) = 120/(1 - x)⁻¹ + 720x/(1 - x)⁻² + 1080x²/(1 - x)⁻³ + 480x³/(1 - x)⁻⁴
+ 60x⁴/(1 - x)⁻⁵.
What is differentiation?A technique for determining a function's derivative is differentiation. Mathematicians use a procedure called differentiation to determine a function's instantaneous rate of change based on one of its variables.
We have to find the fourth derivative of f(x), f(x) = 5x⁴/(1 - x)⁻¹
The derivatives of f(x) up to the fourth order can then be discovered by continually applying the product rule,
f'(x) = 20x³/(1 - x)⁻¹ - 5x⁴/(1 - x)⁻²
f''(x) = 60x²/(1 - x)⁻¹ + 40x³/(1 - x)⁻² + 10x⁴/(1 - x)⁻³
f'''(x) = 120x/(1 - x)⁻¹ + 180x²/(1 - x)⁻² + 120x³/(1 - x)⁻³ + 20x⁴/(1 - x)⁻⁴
f''''(x) = 120/(1 - x)⁻¹ + 720x/(1 - x)⁻² + 1080x²/(1 - x)⁻³ + 480x³/(1 - x)⁻⁴ +
60x⁴/(1 - x)⁻⁵.
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Harper is going to create a graph of the
equation y = -0.5x + 12. Which of the following
will be true about the graph
The graph of the equation y = -0.5x + 12 will be a straight line
How to determine the true statement about the graphThe equation y = -0.5x + 12 represents a linear function
The slope of the line is -0.5The y-intercept (the value of y when x = 0) is 12Based on the slope -0.5 this means that as the value of x increases, the value of y will decrease.
Additionally, since the y-intercept is 12, the line will cross the y-axis at the point (0, 12).
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Under her cell phone plan, Paisley pays a flat cost of $60 per month and $3 per gigabyte. She wants to keep her bill under $75 per month. Write and solve an inequality which can be used to determine g g, the number of gigabytes Paisley can use while staying within her budget.
Answer:
Step-by-step explanation:
The inequality to determine the number of gigabytes Paisley can use while staying within her budget can be written as:
60 + 3g < 75
Solving for g:
60 + 3g < 75
-60 -60
0 + 3g < 15
/3 /3
g < 5
So Paisley can use up to 5 gigabytes while staying within her budget.
Complete the proof.
Statements
AB= 3, BC = 5, and CA = 3.5
LM=6.3, MN = 9, and NL = 5.4
NL 5.4
AB
MN
5.4
3
=
9
||
5
BC
LM 6.3
CA
3.5
9
Octo
=
= 1.8
= 1.8
5
6.3
3.5
N = MN = LM
AABC →ALNM
ZB ZN
= 1.8
Reasons
given
substitution property of equality
simplify
Corresponding angles of similar triangles are congruent.
The proof is completed as follows
Statement Reason
NL/AB = MN/BC = LM/CA ratios of side of similar triangles are equal
Δ ABC is similar to Δ LNM Definition of similar triangles
What are similar triangles?
Similar triangles are triangles that have the same shape but may differ in size. That is to say, they have the same angles but their sides may be scaled differently.
When two triangles are similar, their corresponding angles are congruent and the corresponding sides are in proportion to each other.
This means that if you know the lengths of any two sides of a similar triangle, you can use those ratios to find the lengths of the other sides.
In the proof, the equation NL/AB = MN/BC = LM/CA means that proportions are equal
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what is the least common denominator for these two fractions
Answer:
Least common denominator is 3.
Step-by-step explanation:
2/3 = 2/3 x 1/1 = 2/3
1/3 = 1/3 x 1/1 = 1/3
Find the mean, median, and mode of the following data. If necessary, round to one more decimal place than the largest number of decimal places given in the data. MLB Batting Averages 0.302 0.278 0.321 0.283 0.311 0.312 0.320 0.276 0.275 0.281 0.305 0.277 0.308 0.303 0.322 0.317 0.305 0.291 0.321 0.277 Copy Data < Answer 6Points Prev Separate multiple answers with commas, if necessary Keypad Selecting a button will replace the entered answer value(s) with the button value. If the button is not selected, the entered answer is used Mean: 0.2293 Median: Modes No mode
From the given information, the mean is 0.3025, the median is 0.3065, and the mode is 0.277 and 0.321.
To find the mean, we need to add up all the values and divide by the total number of values:
Mean = $\frac{0.302 + 0.278 + 0.321 + 0.283 + 0.311 + 0.312 + 0.320 + 0.276 + 0.275 + 0.281 + 0.305 + 0.277 + 0.308 + 0.303 + 0.322 + 0.317 + 0.305 + 0.291 + 0.321 + 0.277}{20} \approx 0.3025$
To find the median, we need to arrange data in the order from smallest to largest:
0.275, 0.276, 0.277, 0.277, 0.278, 0.281, 0.283, 0.291, 0.305, 0.305, 0.308, 0.311, 0.312, 0.317, 0.320, 0.321, 0.321, 0.322, 0.303, 0.302
There are 20 values, so median is average of the 10th and 11th values:
Median = $\frac{0.305 + 0.308}{2} = 0.3065$
To find the mode, we look for the value that appears most frequently. In this case, there are two modes: 0.277 and 0.321.
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if m<1= 38 degrees and m<2=78. degrees what is m<3
Given two lines with slopes m<1 and m<2, the slope of a third line that is perpendicular to these lines would be the negative reciprocal of either slope. The negative reciprocal of m<1 is -1/m<1 and the negative reciprocal of m<2 is -1/m<2.
Since m<1 = 38 degrees, the negative reciprocal of m<1 would be -1/38.
And since m<2 = 78 degrees, the negative reciprocal of m<2 would be -1/78.
So, if m<3 is the slope of a line perpendicular to the lines with slopes m<1 and m<2, then m<3 could be either -1/38 or -1/78, depending on which slope is chosen.
do yall know this awser?
The missing side length is 7 yd.
What is the missing side length?The object given is made up of two rectangles. The width of the upright rectangle is to be determined. In order to determine this value, the mathematical operation that would be used is subtraction.
Subtraction is the process of determining the difference between two or more numbers. The sign that is used to represent subtraction is -.
Width of the upright rectangle = 15 - 8 = 7 yd
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Determine whether each statement is always, sometimes, or never true.
a. The difference of a binomial and a binomial is a binomial.
Answer Choices:
Always
Sometimes
Never
Question 2
b. When a 6th-degree polynomial with 5 terms is written in standard form, the second term has a degree of 5.
Answer Choices:
Always
Sometimes
Never
Question 3
c. The sum of a 4th-degree polynomial and a 2nd-degree polynomial is a 2nd-degree polynomial.
Answer Choices:
-Always
-Sometimes
-Never
Answer:
a. Never
b. Never
c. Sometimes
Step-by-step explanation:
a. The difference of a binomial and a binomial is never a binomial, as the result will always be another type of expression.
b. When a 6th-degree polynomial with 5 terms is written in standard form, the second term will always have a degree that is less than the 6th degree, since there are only 5 terms and the degree of each term decreases as its position increases.
c. The sum of a 4th-degree polynomial and a 2nd-degree polynomial is sometimes a 2nd-degree polynomial, depending on the coefficients of the terms. It is possible for the degree of the sum to be lower than the degree of both individual polynomials if the coefficients of the higher degree terms cancel out.
The difference of a binomial and a binomial always yields a binomial. A 6th-degree polynomial with 5 terms in standard form always has a degree of 5 for the second term. The sum of a 4th-degree polynomial and a 2nd-degree polynomial never results in a 2nd-degree polynomial.
Explanation:1. For the operation a. The difference of a binomial and a binomial is a binomial.
Answer: Always
Reason: This is true because when you subtract a binomial from another, the result is always a binomial as well. For instance, (x+y)-(x-y) would result in 2y, a binomial.
2. For the operation b. When a 6th-degree polynomial with 5 terms is written in standard form, the second term has a degree of 5.
Answer: Always
Reason: This is always the case because in ordered or standard form, the terms decrease by degree in sequence
3. For the operation c. The sum of a 4th-degree polynomial and a 2nd-degree polynomial is a 2nd-degree polynomial.
Answer: Never
Reason: The highest degree of the sum of two polynomials is the higher degree of the individual polynomials, in this case, it would be a 4th degree polynomial.
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find the area of polygon ABCD with vertices A(5, -3), B(-1, -3), C(-1, 2), D(5, 6)
The area of polygon ABCD is 31 square units.
What are coordinates?Coordinating refers to the process of organizing or synchronizing different elements or parts to work together in a harmonious and efficient manner towards a common goal or objective. In other words, coordinating involves bringing together various people, resources, activities, or tasks in a way that maximizes their effectiveness and minimizes any conflicts or inefficiencies.
We can find the area of polygon ABCD using the formula for the area of a quadrilateral:
Area = 1/2 * |(x1y2 + x2y3 + x3y4 + x4y1) - (y1x2 + y2x3 + y3x4 + y4x1)|where (x1, y1), (x2, y2), (x3, y3), and (x4, y4) are the coordinates of the vertices of the quadrilateral in order.
Substituting the coordinates of the given vertices, we get:
Area = 1/2 * |(5*(-3) + (-1)2 + (-1)6 + 5(-3)) - (-3(-1) + (-1)5 + 2(-1) + 6*5)|
Simplifying this expression, we get:
Area = 1/2 * |(-15 - 2 - 6 - 15) - (3 + 5 - 2 + 30)|
Area = 1/2 * |-38 - 24|
Area = 1/2 * |-62|
Area = 31
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7. Notice the right triangle inside the pyramid. Given a hypotenuse of 10 in and leg of 8
in, use the Pythagorean Theorem to find the true height (H) of the pyramid. What is
the volume of the pyramid?
The Volume of Pyramid is 512 in³.
What is Volume?Each thing in three dimensions takes up some space. The volume of this area is what is being measured. The space occupied within an object's borders in three dimensions is referred to as its volume.
Given:
Hypotenuse= 10 inch
leg length= 8 inch
Using Pythagorean Theorem
h² = 10² - 8²
h²= 100 - 64
h = 6 inch
So, the Volume of Pyramid
= lwh/3
= 6 x 16 x 16 /3
= 2 x 196
= 512 in³
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Which trig function could
be used to solve for the
length of side c using the
50 degree angle?
A. sine
B. cosine
C. tangent
C
14
50°
Answer:
C
Step-by-step explanation:
in the triangle with respect to the 50° angle, the side opposite is c and the adjacent side is 14.
thus using the tangent ratio in the right triangle
tan50° = [tex]\frac{opposite}{adjacent}[/tex] = [tex]\frac{c}{14}[/tex] ( multiply both sides by 14 )
14 × tan50° = c , then
c ≈ 16.7 ( to 1 decimal place )
In this problem, the cosine function is used to solve for the length of side C in a right-angled triangle, because the angle and the adjacent side are known. According to trigonometry, the cosine for an angle is the length of the adjacent side divided by the hypotenuse.
Explanation:In the given right-angled triangle, since the length of side C (hypotenuse) is unknown and one of the acute angles (50 degrees) is known, you should use the cosine function to solve for the length of side C. According to Trigonometry, cosine of an angle (in a right-angled triangle) is equal to the adjacent side divided by the hypotenuse. Hence, cos(50) = 14 / C. You could solve this equation for C.
Note that:
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13. (5 points)
The South Florida Fair is coming to town.
Admission to the fair costs $32.50 and each ride
costs $0.60. You have $52 to spend at the South
Florida Fair including admission.
orth
Part A: Write an inequality that represents this
situation.
Part B: Solve the inequality to determine the
maximum number of rides you can
enjoy at the South Florida Fair?
Part A: Let x be the number of rides you can enjoy at the South Florida Fair. The total cost of admission and rides cannot exceed the $52 you have, so we can write the following inequality:
32.50 + 0.60x ≤ 52
Part B: We can solve the inequality by first subtracting 32.50 from both sides:
0.60x ≤ 19.50
Then, we can divide both sides by 0.60 to isolate x:
x ≤ 32.5
Therefore, the maximum number of rides you can enjoy at the South Florida Fair is 32 rides, since you need to pay for admission and cannot exceed the $52 you have to spend.
Andy ate breakfast when his
clock had the time shown of 7:05. The clock stopped 12 minutes before breakfast. What time did Andy eat breakfast?
Answer: 7:17
Step-by-step explanation:
Ate breakfast 7:05
Clock stopped 12 minutes before
7:05 + 12 = 7:17
The line y = 3x – 8 cuts the x-axis at point D. what are the coordinates of D?
The coordinates of D on the given line segment is (8/3, 0).
What are the coordinates of midpoint of the line segment AB?Suppose we've two endpoints of a line segment as:
A(p,q), and B(m,n)
Then let the midpoint be M(x,y) on that line segment. Then, its coordinates are:
[tex]x = \dfrac{p+m}{2}[/tex]
and
[tex]y = \dfrac{q+n}{2}[/tex]
We are given that;
y = 3x – 8
Now,
When a line cuts the x-axis, its y-coordinate is always 0. Therefore, we can substitute y = 0 into the equation y = 3x - 8 and solve for x:
0 = 3x - 8
3x = 8
x = 8/3
Therefore, the point D has coordinates (8/3, 0).
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Let −2 ≤ x ≤ 5 and a ≤ 4x + 1 ≤ b
If −2 ≤ x ≤ 5 and a ≤ 4x + 1 ≤ b, then the inequality can be written as:
−7 ≤ 4x + 1 ≤ 21
What is expression ?
An expression in mathematics is a combination of numbers, variables, and mathematical operations, such as addition, subtraction, multiplication, and division, that represents a value or a quantity. Expressions can be simple or complex, and they can be written in various forms, such as using variables, exponents, radicals, logarithms, trigonometric functions, and more.
For example, 2x + 5 is an expression that contains a variable x and represents a value that depends on the value of x. Another example is √(a^2 + b^2), which is an expression that contains two variables a and b and represents the square root of the sum of their squares.
According to given condition :
We know that −2 ≤ x ≤ 5. Therefore, the smallest possible value of 4x is −8 (when x = −2) and the largest possible value of 4x is 20 (when x = 5). Adding 1 to both sides of the inequality, we get:
−8 + 1 ≤ 4x + 1 ≤ 20 + 1
−7 ≤ 4x + 1 ≤ 21
So, a = −7 and b = 21.
Therefore, if −2 ≤ x ≤ 5 and a ≤ 4x + 1 ≤ b, then the inequality can be written as:
−7 ≤ 4x + 1 ≤ 21
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A car drove at 65 miles per hour 7 hours. How many miles are left if the entire trip is 540 miles ?
Answer: 85 miles left
Step-by-step explanation:
65 miles x 7 hours = 455 miles
540 miles - 455 miles = 85 miles
Write a function that models the data.
The function that models the data is y = 42 ([tex]\frac{1}{2}[/tex])ˣ.
What are Exponential Functions?Exponential functions are functions where the independent variable, x is in the exponent.
From the graph, it is clear that it is an exponential function.
Exponential functions will be of the form y = k bˣ.
We have the point (0, 42).
Substituting the point,
k b⁰ = 42
k = 42, since any number raised to 0 is 1, b⁰ = 1.
So the function is y = 42 bˣ.
Substituting the point (1, 21),
42 b¹ = 21
b = 21 / 42
b = 1/2
So the function is y = 42([tex]\frac{1}{2}[/tex])ˣ.
Hence the function is y = 42([tex]\frac{1}{2}[/tex])ˣ.
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Tracked Emails. According to a 2017 Wired magazine article, 40% of emails that are received are tracked using software that can tell the email sender when, where, and on what type of device the email was opened (Wired magazine website). Suppose we randomly select 50 received emails. a. What is the expected number of these emails that are tracked? b. What are the variance and standard deviation for the number of these emails that are tracked? 11. Mailing Machine Malfunctions. A technician services mailing machines at companies in the Phoenix area. Depending on the type of malfunction, the service call can take 1, 2, 3, or 4 hours. The different types of malfunctions occur at about the same frequency. a. Develop a probability distribution for the duration of a service call. b. Draw a graph of the probability distribution. c. Show that your probability distribution satisfies the conditions required for a discrete probability function. d. What is the probability a service call will take three hours? e. A service call has just come in, but the type of malfunction is unknown. It is 3:00 P.M. and service technicians usually get off at 5:00 P.M. What is the probability the service technician will have to work overtime to fix the machine today?
Using standard deviation, the probability that the service technician will have to work overtime to fix the machine today is 0.5.
What does standard deviation mean?The degree of variance or dispersion in a set of data values is measured by standard deviation. It gauges how far the data values depart from the data set's mean (average).
The mean of the data set is first determined, then the standard deviation. The difference between each data point and the mean is then squared for each data point. After dividing the total number of data points by the sum of these squared differences, minus one, the standard deviation is calculated by taking the square root of this result.
a. The expected number of emails that are tracked can be found by multiplying the total number of emails by the probability that an email is tracked:
Expected number of tracked emails = 50 x 0.4 = 20
Therefore, we can expect that 20 out of 50 received emails will be tracked.
b. To find the variance and standard deviation for the number of tracked emails, we can use the formula:
Variance = np(1-p)
Standard deviation = sqrt(np(1-p))
where n is the number of trials (in this case, 50) and p is the probability of success (0.4).
Variance = 50 x 0.4 x (1 - 0.4) = 12
Standard deviation = sqrt(50 x 0.4 x (1 - 0.4)) ≈ 3.46
Therefore, the variance for the number of tracked emails is 12 and the standard deviation is approximately 3.46.
c. The probability distribution for the duration of a service call is:
Duration (hours) Probability
1 0.25
2 0.25
3 0.25
4 0.25
d. The probability that a service call will take three hours is 0.25, as shown in the probability distribution table.
e. To find the probability that the service technician will have to work overtime, we need to calculate the probability that a service call will take longer than two hours, since the technicians usually get off at 5:00 P.M. and it is currently 3:00 P.M.
The probability that a service call will take longer than two hours is:
P(call takes 3 hours or 4 hours) = P(call takes 3 hours) + P(call takes 4 hours) = 0.25 + 0.25 = 0.5
Therefore, the probability that the service technician will have to work overtime to fix the machine today is 0.5.
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