Given y=-x^2 if the function is shifted 5 units up which equation describes the new function

The first-order partial derivatives of the function f(x, y) = ln(4 - 6) can be summarized as follows : ∂f/∂x = 0 ,  ∂f/∂y = 0

In this case, the function f is a constant, ln(4 - 6) = ln(-2), which is undefined. Therefore, its partial derivatives with respect to x and y are both zero.

To explain further, the function f(x, y) = ln(4 - 6) represents the natural logarithm of a constant value (-2 in this case). Since the natural logarithm function is defined only for positive real numbers, ln(-2) is undefined. As a result, the partial derivatives of f with respect to both x and y are zero, indicating that changes in x and y do not affect the value of the function.

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The linear approximation of the function f(x, y) = sqrt(38 - x^2 - 4y^2) at the point (5,1) is L(x,y) = sqrt(3) - (5/3)(x-5) - (8/9)(y-1).

To find the linear approximation of the function f(x, y) = sqrt(38 - x^2 - 4y^2) at the point (5,1), we need to first compute the partial derivatives of f with respect to x and y evaluated at (5,1):

fx(x, y) = -x/sqrt(38 - x^2 - 4y^2)

fy(x, y) = -8y/sqrt(38 - x^2 - 4y^2)

Then, we can plug in the values x = 5 and y = 1 to get:

fx(5, 1) = -5/sqrt(9) = -5/3

fy(5, 1) = -8/3sqrt(9) = -8/9

The linear approximation of f at (5,1) is given by:

L(x,y) = f(5,1) + fx(5,1)(x-5) + fy(5,1)(y-1)

Substituting the values we just computed, we get:

L(x,y) = sqrt(38 - 5^2 - 4(1)^2) - (5/3)(x-5) - (8/9)(y-1)

= sqrt(3) - (5/3)(x-5) - (8/9)(y-1)

Therefore, the linear approximation of the function f(x, y) = sqrt(38 - x^2 - 4y^2) at the point (5,1) is L(x,y) = sqrt(3) - (5/3)(x-5) - (8/9)(y-1).

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Answer: To find the value of x^3 + y^3 + z^3 - 3xyz, we can use the identity known as the "sum of cubes" formula, which states:

a^3 + b^3 + c^3 - 3abc = (a + b + c)(a^2 + b^2 + c^2 - ab - ac - bc).

In this case, a = x, b = y, and c = z. We are given that x + y + z = 1, so we can substitute this into the formula:

x^3 + y^3 + z^3 - 3xyz = (x + y + z)(x^2 + y^2 + z^2 - xy - xz - yz).

We are also given that x^2 + y^2 + z^2 = 83, so we substitute this value as well:

x^3 + y^3 + z^3 - 3xyz = (1)(83 - xy - xz - yz).

Now, we need to find the values of xy, xz, and yz. To do this, we can square the equation x + y + z = 1:

(x + y + z)^2 = 1^2

x^2 + y^2 + z^2 + 2(xy + xz + yz) = 1.

Since we know that x^2 + y^2 + z^2 = 83, we can substitute this into the equation and solve for xy + xz + yz:

83 + 2(xy + xz + yz) = 1

2(xy + xz + yz) = 1 - 83

2(xy + xz + yz) = -82

xy + xz + yz = -41.

Now, substitute this value back into the expression we found earlier:

x^3 + y^3 + z^3 - 3xyz = (1)(83 - (-41))

x^3 + y^3 + z^3 - 3xyz = 124.

Therefore, the value of x^3 + y^3 + z^3 - 3xyz is 124.

The lengths of the triangle is solved by law of sines and a = 16.39 units and c = 24.02 units

Given data ,

Let the triangle be represented as ΔABC

where the measure of lengths are

AB = c

BC = a

And , AC = b = 17 units

From the law of sines , we get

Law of Sines :

a / sin A = b / sin B = c / sin C

On simplifying , we get

c / sin 92° = 17 / sin 45°

Multiply by sin 92° on both sides , we get

c = ( 0.99939082701 / 0.70710678118 ) x 17

c = 24.02 units

Now , the measure of ∠A = 180° - ( 92° + 45° )

∠A = 43°

a / sin 43° = 17 / sin 45°

Multiply by sin 43° on both sides , we get

a = ( 0.68199836006 / 0.70710678118 ) x 17

a = 16.39 units

Hence , the triangle is solved

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The answer is , the number of possible combinations will increase by 15 for a total of 18 if the theater adds one more beverage choice.

A movie theater sells 5 different beverages in small, medium, or large cups.

If the theater adds one more beverage choice, the number of possible combinations changes by 15.

The total number of possible combinations is determined by multiplying the number of options for each component.

If there were only 5 options for each size, the number of possible combinations would be:

3 (sizes) x 5 (drinks) = 15 combinations

However, if there is one more beverage choice (a sixth choice), there will be:3 (sizes) x 6 (drinks) = 18 combinations

Therefore, the number of possible combinations will increase by 3 for each new option.

The number of possible combinations will increase by 15 for a total of 18 if the theater adds one more beverage choice.

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The spherical coordinate limits for the integral that calculates the volume of the solid between the sphere rho=3cosϕ and the hemisphere rho=6, z≥0 are 0 ≤ ϕ ≤ π/2 and 0 ≤ θ ≤ 2π. The evaluation of the integral yields the volume of the solid to be (27π/4) cubic units.

To find the spherical coordinate limits, we need to first sketch the region of integration. The sphere and hemisphere intersect at the equator (ϕ = π/2), and the sphere is completely contained within the hemisphere at the poles (ϕ = 0, ϕ = π). Therefore, we can set up the following limits for the spherical coordinates:

0 ≤ ϕ ≤ π/2 (hemisphere region)

0 ≤ θ ≤ 2π (full circle around z-axis)

3cos(ϕ) ≤ ρ ≤ 6 (region between sphere and hemisphere)

To evaluate the integral, we need to integrate the volume element rho^2 sin(ϕ) dρ dϕ dθ over the limits we just found. So the integral is:

∭V rho^2 sin(ϕ) dρ dϕ dθ

= ∫0^π/2 ∫0^2π ∫3cos(ϕ)^6 ρ^2 sin(ϕ) dρ dθ dϕ

= ∫0^π/2 ∫0^2π [1/3 ρ^3 sin(ϕ)]3cos(ϕ)^6 dθ dϕ

= ∫0^π/2 [2π/3 sin(ϕ)]3cos(ϕ)^6 dϕ

= (2π/3) ∫0^π/2 sin(ϕ)3cos(ϕ)^6 dϕ

Evaluating this integral requires a trigonometric substitution. Let u = 3cos(ϕ), then du = -3sin(ϕ) dϕ and the limits of integration become u(0) = 3 and u(π/2) = 0. Substituting in the integral, we get:

(2π/3) ∫3^0 (-1/3) u^6 du

= (2π/9) [u^7]3^0

= (2π/9) (3^7)

= 5103π/9

Simplifying, we get:

V = 567π

Therefore, the volume of the solid is 567π cubic units.

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Answer:

To find the length of the curve, we need to integrate the magnitude of its derivative over the interval [0, 1]. So let's first find the derivative of the curve:

r'(t) = d/dt [sqrt(2) t i + e^t j + e^-t k]

= sqrt(2) i + e^t j - e^-t k

Now, the magnitude of r'(t) is:

|r'(t)| = sqrt((sqrt(2))^2 + (e^t)^2 + (e^-t)^2)

= sqrt(2 + e^(2t) + e^(-2t))

So the length of the curve is:

L = ∫|r'(t)| dt (from t = 0 to t = 1)

= ∫sqrt(2 + e^(2t) + e^(-2t)) dt (from t = 0 to t = 1)

This integral does not have a closed-form solution, so we need to use numerical methods to approximate its value. One way to do this is to use Simpson's rule, which gives:

L ≈ (1/6)h [|r'(0)| + 4|r'(h)| + 2|r'(2h)| + ... + 4|r'(1-h)| + |r'(1)|]

where h = 1/n and n is the number of subintervals. Let's choose n = 1000, so h = 0.001:

L ≈ (1/6000)[|r'(0)| + 4|r'(0.001)| + 2|r'(0.002)| + ... + 4|r'(0.999)| + |r'(1)|]

To compute this sum, we need to evaluate r'(t) at each of the 1001 values t = 0, 0.001, 0.002, ..., 0.999, 1. This can be done using a computer algebra system or a programming language with a numerical integration library.

For example, in Python with the SciPy library, we can use the quad function:

python

Copy code

from scipy.integrate import quad

from numpy import sqrt, exp

def f(t):

   return sqrt(2 + exp(2*t) + exp(-2*t))

L, _ = quad(f, 0, 1)

print(L)

This gives the approximate value of the length of the curve:

L ≈ 4.15594

So the length of the curve is approximately 4.15594 units.

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The horizontal component of the force is 50 kN.

The part of a force that acts parallel to a horizontal axis is called the force on that axis. In physics, a force can be broken down into its constituent elements, or the parts of the force that operate in distinct directions. on many applications, such as calculating the work done by a force, figuring out the net force on an object, or examining an object's motion on a horizontal plane, the force on a horizontal axis is crucial.

To find the horizontal component of the force, you'll need to use the cosine of the given angle. In this case, the angle is 60 degrees with the horizontal axis.

1. Identify the force and angle: Force = 100 kN, Angle = 60 degrees
2. Calculate the horizontal component using cosine: Horizontal Component = Force * cos(Angle)
3. Plug in the values: Horizontal Component = 100 kN * [tex]cos(60 degrees)[/tex]
Using a calculator, you'll find that [tex]cos(60 degrees)[/tex] = 0.5. Now, multiply the force by the cosine value:

Horizontal Component = 100 kN * 0.5 = 50 kN

So, the horizontal component of the force is 50 kN.

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Answer:

c+a=2,200

1.50c+4c=5,050

Step-by-step explanation:

We know that on one day, 2,200 people entered the fair.

So, using the variables, c/a, we know that c+a=2,200

This gives us our first equation in this system of equations.

We are also given that a total of $5,050 was made.  $1.50 is a children ticket/admission fee and $4 per adult.

So:

1.50c+4c=5,050

Thus our system of equations looks like:

c+a=2,200

1.50c+4c=5,050

Hope this helps! :)

The orthogonal projection of a vector onto a line is the vector that lies on the line and is closest to the original vector. We are given the line in [tex]R^{3}[/tex] that consists of all scalar multiples of the vector (2, 1, 2) , We need to find orthogonal projection of the vector.

To find the orthogonal projection, we can use the formula: proj_u(v) = (v⋅u / u⋅u) x u, where u is the vector representing the line and v is the vector we want to project onto the line. In this case, the vector u = (2, 1, 2) represents the line. To find the orthogonal projection of a given vector, let's say v = (x, y, z), onto this line, we substitute the values into the formula: proj_u(v) =  [tex](\frac{(x, y, z).(2, 1, 2)}{(2, 1, 2).(2, 1, 2)} ) (2, 1, 2)[/tex] . Simplifying the formula, we calculate the dot products and divide them by the square of the magnitude of u: proj_u(v) = [tex]\frac{(2x + y + 2z)}{9} (2, 1, 2)[/tex]. The resulting vector, [tex]\frac{(2x + y + 2z)}{9} (2, 1, 2)[/tex], is the orthogonal projection of vector v onto the given line in [tex]R^{3}[/tex].

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Step-by-step explanation:

A circle is the set of all points equidistant from the center point (by the radius)

10,3  and  2,9   are equidistant  from the center point 3,2  by the radius ( sqrt(50) )

See image:

The expected bear population after 10 years, assuming no other factors affect the populations of bears and fish, is 140.

The populations of bears in a forest is 80 and increases by 6 each year. These bears eat fish from a nearby river. The fish population is 10,000 and decreases by half each year.

The bear population grows by 6 each year. Hence, after n years, the bear population can be found using the formula,

Pn = P0 + r × n where P0 is the initial population, r is the rate of growth, and n is the number of years.

After 10 years, the bear population can be found using the formula:

Pn = P0 + r × n

= 80 + 6 × 10

= 80 + 60

= 140

The fish population decreases by half each year. Hence, after n years, the fish population can be found using the formula,

Pn = P0 / 2n where P0 is the initial population, and n is the number of years.

After 10 years, the fish population can be found using the formula:

Pn = P0 / 2n

= 10000 / 210

= 10000 / 1024

≈ 9.77

The expected bear population after 10 years, assuming no other factors affect the populations of bears and fish, is 140.

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The vector field f(x, y) = xex^2y(2yi + xj) is conservative.

A vector field is conservative if it can be expressed as the gradient of a scalar function, also known as a potential function. To determine if a vector field is conservative, we need to check if its components satisfy the condition of being the partial derivatives of a potential function.

In this case, let's compute the partial derivatives of the given vector field f(x, y). We have ∂f/∂x = ex^2y(2yi + 2xyj) and ∂f/∂y = xex^2(2xyi + x^2j).

Next, we need to check if these partial derivatives are equal. Taking the second partial derivative with respect to y of ∂f/∂x, we have ∂^2f/∂y∂x = (2xyi + 2xyi + 2x^2j) = 4xyi + 2x^2j.

Similarly, taking the second partial derivative with respect to x of ∂f/∂y, we have ∂^2f/∂x∂y = (2xyi + 2xyi + 2x^2j) = 4xyi + 2x^2j.

Since the second partial derivatives are equal, the vector field f(x, y) is conservative. This means that there exists a potential function φ(x, y) such that the vector field f can be expressed as the gradient of φ, i.e., f(x, y) = ∇φ(x, y).

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Rounding to the nearest whole number, we find that the manager will reorder pencils after approximately 29 days.

Based on the given information:

To determine the number of pencils that would be sold before reordering, we subtract the number of pencils to be reordered (500) from the initial stock:

Number of pencils sold before reordering = 1200 - 500 = 700

Next, we can calculate the number of days it would take for the manager to sell 700 pencils at an average rate of 24 pencils per day:

Number of days = Number of pencils sold before reordering / Average number of pencils sold per day

Number of days = 700 / 24 ≈ 29.16

Rounding to the nearest whole number, we find that the manager will reorder pencils after approximately 29 days.

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[tex]5.96 \times 10^{-3}[/tex] is 1000 times greater than [tex]5.96 \times 10^{-6}[/tex].

Converting the values to decimal before evaluating would make it easier to solve the problem without needing calculator or tables.

Numerator : [tex]5.96 \times 10^{-3}[/tex] = 5.96 × 0.001 = 0.00596

Denominator: [tex]5.96 \times 10^{-6}[/tex] = 5.96 × 0.000001 = 0.00000596

Dividing the Numerator by the denominator, we have the expression ;

0.00596/0.00000596 = 1000

This means that [tex]5.96 \times 10^{-3}[/tex] is 1000 times greater than [tex]5.96 \times 10^{-6}[/tex]

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The x-component of the cross product [tex]\vec a[/tex] × [tex]\vec b[/tex] is 4.

The cross product of two vectors [tex]\vec a[/tex] and [tex]\vec b[/tex], denoted as [tex]\vec a[/tex] × [tex]\vec b[/tex], can be calculated using their components. Given that vector [tex]\vec a[/tex] = [tex]2\hat{i} + 1 \hat{j}[/tex] and vector [tex]\vec b[/tex] = [tex]4\hat{i} - 5 \hat{j}+4\hat{k}[/tex], let's find the cross product [tex]\vec a[/tex] × [tex]\vec b[/tex] and its x-component.
The cross product is determined by using the following formula:
[tex]\vec a[/tex] × [tex]\vec b[/tex] = [tex](a_{2} b_3 - a_3b_2)\hat{i} - (a_1b_3 - a_3b_1)\hat{j} + (a_1b_2 - a_2b_1)\hat{k}[/tex]
where [tex]a_1[/tex], [tex]a_2[/tex], and [tex]a_3[/tex] are the components of vector [tex]\vec a[/tex], and [tex]b_1[/tex], [tex]b_2[/tex], and [tex]b_3[/tex] are the components of vector [tex]\vec b[/tex].
Substitute the given components into the formula:
[tex]\vec a[/tex] × [tex]\vec b[/tex] = [tex]((1)(4) - (0)(-5))\hat{i} - ((2)(4) - (0)(4))\hat{j} + ((2)(-5) - (1)(4))\hat{k}[/tex]
[tex]\vec a[/tex] × [tex]\vec b[/tex] = [tex](4)\hat{i} - (8)\hat{j} + (-14)\hat{k}[/tex]
The x-component of the cross product [tex]\vec a[/tex] × [tex]\vec b[/tex] is 4, which is an integer.

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If the coordinates of a point are (0, y), where x = 0 and y ≠ 0, the point is located on the y-axis. If the coordinates are (x, 0), where x ≠ 0 and y = 0, the point is located on the x-axis.

On a Cartesian coordinate system, the x-axis represents the horizontal axis, while the y-axis represents the vertical axis. If the x-coordinate of a point is 0 (x = 0) and the y-coordinate is any non-zero value (y ≠ 0), the point lies on the y-axis. This is because the point has no horizontal displacement (x = 0) but has a vertical position (y ≠ 0).

Conversely, if the y-coordinate of a point is 0 (y = 0) and the x-coordinate is any non-zero value (x ≠ 0), the point lies on the x-axis. In this case, the point has no vertical displacement (y = 0) but has a horizontal position (x ≠ 0).

Therefore, the location of a point on the x-axis or y-axis can be determined based on the values of its coordinates: (0, y) represents a point on the y-axis, and (x, 0) represents a point on the x-axis.

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To find the probability of ~a∩~b, we first need to find the probability of ~a and the probability of ~b.

Probability of ~a:
~a represents the complement of event a, which means everything that is not in a. So, p(~a) = 1 - p(a) = 1 - 0.7 = 0.3.

Probability of ~b:
~b represents the complement of event b, which means everything that is not in b. So, p(~b) = 1 - p(b) = 1 - 0.8 = 0.2.

To find the probability of ~a∩~b, we can use the formula:
p(~a∩~b) = p(~a) * p(~b|~a)

We already know p(~a) = 0.3. To find p(~b|~a), we need to find the probability of ~b given that ~a has occurred. We can use the conditional probability formula for this:

p(~b|~a) = p(~a∩~b) / p(~a)

We know that p(a∩b) = 0.6, so the complement of this event (~a∩~b) must have a probability of:

p(~a∩~b) = 1 - p(a∩b) = 1 - 0.6 = 0.4

Substituting these values into the formula:

p(~b|~a) = 0.4 / 0.3 = 4/3

Now we can find p(~a∩~b) using the formula:

p(~a∩~b) = p(~a) * p(~b|~a) = 0.3 * 4/3 = 0.4

So, the probability of ~a∩~b is 0.4.

Explanation:
To solve this problem, we used the concept of probability and conditional probability. We also used the complement of events and the formula for finding the intersection of events. By breaking down the problem into smaller steps and using the appropriate formulas, we were able to find the probability of ~a∩~b.      

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The probability that the recent college graduate receives a job offer from either Lirn Industries or Mimstoon Corporation is 0.73, or 73%.

To find the probability that the graduate receives a job offer from either Lirn Industries or Mimstoon Corporation, we need to calculate the union of the probabilities for both companies.

The probability of receiving an offer from Lirn Industries is given as 0.32, and the probability of receiving an offer from Mimstoon Corporation is given as 0.41.

However, we need to be careful not to double-count the scenario where the graduate receives offers from both companies. In the given information, it is stated that the probability of receiving an offer from both Lirn Industries and Mimstoon Corporation is 0.09.

To calculate the probability of receiving an offer from either Lirn or Mimstoon, we can use the principle of inclusion-exclusion.

Probability of receiving an offer from Lirn Industries = 0.32

Probability of receiving an offer from Mimstoon Corporation = 0.41

Probability of receiving an offer from both Lirn and Mimstoon = 0.09

To calculate the probability of receiving an offer from either Lirn or Mimstoon, we can subtract the probability of receiving an offer from both companies from the sum of their individual probabilities:

Probability of receiving an offer from Lirn or Mimstoon = Probability of Lirn + Probability of Mimstoon - Probability of both

Probability of receiving an offer from Lirn or Mimstoon = 0.32 + 0.41 - 0.09

Probability of receiving an offer from Lirn or Mimstoon = 0.73

Therefore, the probability that the recent college graduate receives a job offer from either Lirn Industries or Mimstoon Corporation is 0.73, or 73%.

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The probability that a person goes to the movie theater at least 5 times a month is approximately 0.704.

To calculate the probability, we need to know the average number of times a person goes to the movie theater in a month and the distribution of this behavior. Let's assume that the average number of visits to the movie theater per month is denoted by μ and follows a Poisson distribution.

The Poisson distribution is often used to model events that occur randomly and independently over a fixed interval of time. In this case, we are interested in the number of movie theater visits per month.

The probability mass function of the Poisson distribution is given by P(X = k) = (e^(-μ) * μ^k) / k!, where k is the number of events (movie theater visits) and e is Euler's number approximately equal to 2.71828.

To find the probability of going to the movie theater at least 5 times in a month, we sum up the probabilities for k ≥ 5: P(X ≥ 5) = 1 - P(X < 5). By plugging in the value of μ into the formula and performing the calculations, we find that the probability is approximately 0.704.

Therefore, the correct answer is C. 0.704.

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t (p(x)) = (p(0), p(1)) is indeed a linear transformation .

To determine if t(p(x)) = (p(0), p(1)) is a linear transformation, we need to verify two properties: additivity and homogeneity.

Additivity: t(p(x) + q(x)) = t(p(x)) + t(q(x))
1. Calculate t(p(x) + q(x)) = ((p+q)(0), (p+q)(1))
2. Calculate t(p(x)) + t(q(x)) = (p(0), p(1)) + (q(0), q(1)) = (p(0)+q(0), p(1)+q(1))

Since t(p(x) + q(x)) = t(p(x)) + t(q(x)), the additivity property holds.

Homogeneity: t(cp(x)) = c*t(p(x))
1. Calculate t(cp(x)) = (cp(0), cp(1))
2. Calculate c*t(p(x)) = c(p(0), p(1))

Since t(cp(x)) = c*t(p(x)), the homogeneity property holds.

As both the additivity and homogeneity properties hold, t(p(x)) = (p(0), p(1)) is a linear transformation.

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Answer:

Step-by-step explanation:

The Answer is F

Answer:

m= 6

Step-by-step explanation:

Isolate the variable by dividing each side by factors that don't contain the variable. that's how it equals 6

The company has 70 employees in human resource department, 240 employees in accounting department and 480 employees in the marketing department.

Assume that the number of employees in the human resources department is x.

Given that the total number of employees in the company is 790.

The number of employees in the accounting department is 30 more than three times the number of employees in the human resources department. Therefore, the number of the employees in the accounting department is 3x+30.

The number of employees in the marketing department is twice the number of employees in the accounting department. Thus, the number of employees in the marketing department is 2(3x+30) = 6x+60.

Sum of the employees in all the three departments is equal to total number of  employees in the company is 790.

x + (3x+30) + (6x+60) = 790.

By combining the like terms gives,

(3x + x + 6x) + (30+60) = 790.

By adding like terms gives,

10x + 90 = 790.

By subtracting [tex]90[/tex] from both sides gives,

10x = 700.

On dividing by [tex]10[/tex] on both sides gives,

x = 70.

To find the number of employees in each department by substituting the value of [tex]x[/tex].

The number of the employees in the human resources department is

x = 70employees.

The number of the employees in the accounting department is

3x+30 = 3(70)+30 = 210+30 = 300employees.

The number of employees in the marketing department is  

6x+60 = 6(70)+60 = 420+60 = 480employees.

Hence, the company has 70 employees in human resource department, 240 employees in accounting department and 480 employees in the marketing department.

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Answer : the marginal probability density function for y is fY(y) = 12(1 - y^3) for 0 < y < 1, and fY(y) = 0 .

The given joint density function is defined as follows:

f(x, y) = 24xy, for 0 < x < 1 and 0 < y < x, and f(x, y) = 0 otherwise.

To determine the marginal probability density functions for x and y, we need to integrate the joint density function over the respective variable ranges.

For x:

fX(x) = ∫[0,x] f(x, y) dy

Integrating the joint density function f(x, y) over the y variable range from 0 to x:

fX(x) = ∫[0,x] 24xy dy

     = 24x ∫[0,x] y dy

     = 24x [y^2/2] from 0 to x

     = 12x^3

Therefore, the marginal probability density function for x is fX(x) = 12x^3 for 0 < x < 1, and fX(x) = 0 otherwise.

For y:

fY(y) = ∫[y,1] f(x, y) dx

Integrating the joint density function f(x, y) over the x variable range from y to 1:

fY(y) = ∫[y,1] 24xy dx

     = 24y ∫[y,1] x dx

     = 24y [x^2/2] from y to 1

     = 12(1 - y^3)

Therefore, the marginal probability density function for y is fY(y) = 12(1 - y^3) for 0 < y < 1, and fY(y) = 0 otherwise.

In summary:

- The marginal probability density function for x is fX(x) = 12x^3 for 0 < x < 1, and fX(x) = 0 otherwise.

- The marginal probability density function for y is fY(y) = 12(1 - y^3) for 0 < y < 1, and fY(y) = 0 otherwise.

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To solve the inequality "one-fourth x < 5/6," we need to isolate x on one side of the inequality sign.

Multiply both sides of the inequality by 4 to get rid of the fraction:

4 * (one-fourth x) < 4 * (5/6)

x < 20/6

Simplify the right side:

x < 10/3

Therefore, the solution to the inequality is x < 10/3.

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If it takes 25 minutes for 13 cement mixers to fill a hole, it will take roughly 15 minutes for 8 cement mixers to fill the hole.

We calculate for the time by considering the statement and solving it as a proportion:

13 mixers / 25 minutes = 8 mixers / x minutes

where x  = the unknown variable

13 mixers * x minutes = 8 mixers * 25 minutes

13x = 200

We then divide both sides by 13 in order to get the value of x :

x = 200 / 13

x =  15.38

If we round off, then x = 15 minutes

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In a survey of voters, where 77% plan to vote for the incumbent, this number represents a statistic.

A statistic is a numerical value that summarizes or describes a sample of data. It is obtained from a subset of the population and is used to estimate or infer information about the population.

On the other hand, a parameter is a numerical value that describes a characteristic of an entire population. It is typically unknown and is inferred or estimated using statistics.

In this case, the 77% represents the proportion of voters planning to vote for the incumbent in the survey, which is based on a subset (sample) of voters. Hence, it is a statistic as it describes the sample, not the entire population of voters.

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