(5.2.2 WP Consider the joint distribution in Exercise 5.1.1. Determine the following: a. Conditional probability distribution of Y given that X = 1.5 b. Conditional probability distribution of X that Y = 2 C. E( Y X = 1.5) d. Are X and Y independent?

The standard error of the mean, rounded to 2 decimal places, is 1.73.

Explanation:

Given that: Forty-five elements were randomly sampled from a population that has 1500 elements. The sample mean is 180 with a varience of 135.

The standard error of the mean (SEM) is a measure of how much the sample mean is likely to vary from the true population mean. It is calculated as the square root of the sample Variance divided by the square root of the sample size.

Thus,

To find the standard error of the mean, we will use the following formula:

Standard Error of the Mean (SEM) = sqrt(Sample Variance) / sqrt(Sample Size)

Given the information in your question, we have:
- Sample Variance = 135
- Sample Size = 45 because forty-five elements were randomly sampled from a population

Now, we'll calculate the standard error of the mean:

1. Calculate the square root of the sample variance: sqrt(135) ≈ 11.62

2. Calculate the square root of the sample size: sqrt(45) ≈ 6.71

3. Divide the results from steps 1 and 2: 11.62 / 6.71 ≈ 1.73

Therefore, the standard error of the mean, rounded to 2 decimal places, is 1.73.

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Answer:

de 200 Pessoa que forum pesquisadas

The eigenvalues and eigenspaces of A are: λ1 = 1 - sqrt(7), eigenspace span{(6 - sqrt(7))/5, 1} and λ2 = 1 + sqrt(7), eigenspace span{(6 + sqrt(7))/5, 1}

To find the eigenvalues and eigenspaces of the matrix A, we need to solve the characteristic equation det(A - λI) = 0, where I is the 2x2 identity matrix.

det(A - λI) = det(leftbracket2.gif 1 5 rightbracket2.gif6 0 - λleftbracket1.gif 0 0 1 rightbracket)

= (2 - λ)(-λ) - (1)(6)

= λ² - 2λ - 6

Using the quadratic formula, we get:

λ = (2 ± sqrt(2² - 4(1)(-6))) / 2

λ = 1 ± sqrt(7)

Therefore, the eigenvalues are λ1 = 1 - sqrt(7) and λ2 = 1 + sqrt(7).

Next, we find the eigenvectors for each eigenvalue by solving the system of equations (A - λI)x = 0.

For λ1 = 1 - sqrt(7), we have:

(A - λ1I)x = leftbracket2.gif 1 5 rightbracket2.gif6 0 - (1 - sqrt(7))leftbracket1.gif 0 0 1 rightbracketx = leftbracket0.gif 0 5 6 - sqrt(7) rightbracketx = 0

Reducing the augmented matrix to row echelon form, we get:

leftbracket0.gif 0 5 6 - sqrt(7) rightbracket --> leftbracket0.gif 0 1 6/(5 + sqrt(7)) rightbracket --> leftbracket0.gif 0 0 0 0 rightbracket

So, the eigenvector corresponding to λ1 is any non-zero solution to the equation 5x2 + (6 - sqrt(7))x1 = 0. We can choose x2 = 1, which gives x1 = (-6 + sqrt(7))/5. Therefore, the eigenspace corresponding to λ1 is span{(6 - sqrt(7))/5, 1}.

For λ2 = 1 + sqrt(7), we have:

(A - λ2I)x = leftbracket2.gif 1 5 rightbracket6 0 - (1 + sqrt(7))leftbracket1.gif 0 0 1 rightbracketx = leftbracket0.gif 0 5 6 + sqrt(7) rightbracketx = 0

Reducing the augmented matrix to row echelon form, we get:

leftbracket0.gif 0 5 6 + sqrt(7) rightbracket --> leftbracket0.gif 0 1 (6 + sqrt(7))/5 rightbracket --> leftbracket0.gif 0 0 0 0 rightbracket

So, the eigenvector corresponding to λ2 is any non-zero solution to the equation 5x2 + (6 + sqrt(7))x1 = 0. We can choose x2 = 1, which gives x1 = (-6 - sqrt(7))/5. Therefore, the eigenspace corresponding to λ2 is span{(6 + sqrt(7))/5, 1}.

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The distance from each tower to the fire is given as follows:

Suppose we have a triangle in which:

The lengths and the sine of the angles are related as follows:

[tex]\frac{\sin{A}}{a} = \frac{\sin{B}}{b} = \frac{\sin{C}}{c}[/tex]

The sum of the measures of the internal angles of a triangle is of 180º, hence the missing angle is given as follows:

c + 42 + 64 = 180

c = 180 - (42 + 64)

c = 74º.

(opposite to 10 miles).

The measure of the angle opposite to Tower A is of 64º, hence the distance is given as follows:

sin(64º)/d = sin(74º)/10

d = 10 x sine of 64 degrees/sine of 74 degrees

d = 9.35 miles.

The measure of the angle opposite to Tower B is of 42º, hence the distance is given as follows:

sin(42º)/d = sin(74º)/10

d = 10 x sine of 42 degrees/sine of 74 degrees

d = 6.96 miles.

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Answer: a

Step-by-step explanation:

The explicit formula for the sequence [tex]{a_n} is a_n = 2n + 4[/tex].

The pattern suggests that the sequence is increasing by 2 for each term. So we can write the formula for the nth term as:

[tex]a_n = a_1 + (n-1)d[/tex]

where a_1 is the first term, d is the common difference (which is 2 in this case), and n is the term number.

Substituting the given values, we get:

[tex]a_n = 6 + (n-1)2[/tex]

Simplifying, we get:

[tex]a_n = 2n + 4[/tex]

Therefore, the explicit formula for the sequence. [tex]{a_n} is a_n = 2n + 4[/tex]

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The set of all symmetric 3x3 matrices satisfies all three conditions for a subspace, it is indeed a subspace of M33

To determine whether the set of all symmetric 3x3 matrices is a subspace of M33, we need to check if it satisfies the three conditions for a subspace:

Closure under addition: If A and B are both symmetric 3x3 matrices, then A+B will also be a symmetric 3x3 matrix since [tex](A+B)^T = A^T + B^T = A + B[/tex]. Therefore, the set is closed under addition.

Closure under scalar multiplication: If A is a symmetric 3x3 matrix and c is a scalar, then cA will also be a symmetric 3x3 matrix since [tex](cA)^T = cA^T = cA[/tex]. Therefore, the set is closed under scalar multiplication.

Contains the zero vector: The zero vector in M33 is the matrix of all zeroes. This matrix is also a symmetric 3x3 matrix since all its entries are equal. Therefore, the set contains the zero vector.

Since the set of all symmetric 3x3 matrices satisfies all three conditions for a subspace, it is indeed a subspace of M33.

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The function y=f(x)=2x−ln(2x) has a global minimum at x=1 and a global maximum at x=2.5 within the interval 1<x<2.5, and there are no local non-global maximum points within the interval.

To find the points where y = f(x) = 2x - ln(2x) has a global maximum, global minimum, and local, non-global maximum on the interval 1 < x < 2.5, we need to find the critical points and analyze the behavior of the function.

1. Find the first derivative: f'(x) = 2 - (1/x)
2. Set f'(x) to zero and solve for x: 2 - (1/x) = 0 => x = 1/2 (but it's outside the interval, so discard it)

So, the critical point of f(x) is at x= 1/2. However, we need to check if this critical point is within the given interval 1<x<2.5. Since 1/2​ is not within that interval, we can conclude that f(x) does not have any critical points within the given interval.

Since there's no critical point within the interval, we need to check the endpoints of the interval:

1. f(1) = 2(1) - ln(2(1)) = 2 - ln(2)
2. f(2.5) = 2(2.5) - ln(2(2.5)) = 5 - ln(5)

Since f(1) < f(2.5), we can conclude that:
Global minimum: At x = 1, f(x) ≈ 2 - ln(2) ≈ 0.31
Global maximum: At x = 2.5, f(x) ≈ 5 - ln(5) ≈ 3.39

So, we can see that f( 1 ) is the global minimum point and f( 2.5 ) is the global maximum point within the given interval.

Local, non-global maximum: Not present within the interval 1 < x < 2.5

In summary, the function y=f(x)=2x−ln(2x) has a global minimum at x=1 and a global maximum at x=2.5 within the interval  1<x<2.5, and there are no local non-global maximum points within the interval.

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The solution for the given initial-value problem using Laplace transform is :

y(t) = sin(t) + [1 -cos(t-π)]U(t-2π) - [1 - cos(t-2π)]U(t-2π)

To solve this initial value problem using Laplace transform, we first need to take the Laplace transform of both sides of the equation:

L[y''](s) + L[y](s) = L[f(t)](s)

Using the properties of Laplace transform, we can simplify this expression to:

s^2Y(s) + Y(s) = 1/s - e^(-πs)/s + e^(-2πs)/s

We can now solve for Y(s):

Y(s) = 1/(s^2 + 1) - e^(-πs)/(s^2 + 1) + e^(-2πs)/(s^2 + 1)

Using partial fraction decomposition, we can write this as:

Y(s) = (1/s) - (sin(t)/2) + [1/2 - cos(t-π)]e^(-πs) - [1/2 - cos(t-2π)]e^(-2πs)

Taking the inverse Laplace transform of Y(s), we get:

y(t) = sin(t) + [1 -cos(t-π)]U(t-2π) - [1 - cos(t-2π)]U(t-2π)

This is the same answer as given in the book.

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Answer:

45

Step-by-step explanation:

When choosing values of x between each intercept and values of x on either side of the vertical asymptotes, it is

important to consider the behavior of the function in those regions.  Choosing values of x close to the intercepts can

give you an idea of the shape of the function in that region.

Choosing values of x close to the vertical asymptotes can help you determine the behavior of the function as x

approaches that value.

Choosing values of x between each intercept and values of x on either side of the vertical asymptotes.

To choose values of x between each intercept and values of x on either side of the vertical asymptotes,

1. Identify the intercepts: Find the points where the function intersects the x-axis and the y-axis. These are the points where the function's value is zero.

2. Identify the vertical asymptotes: Determine the values of x where the function is undefined or has a vertical asymptote.

3. Choose values of x between each intercept: Select a value between each pair of intercepts that you found in step 1. These values will help you understand the function's behavior between the intercepts.

4. Choose values of x on either side of the vertical asymptotes: Select a value slightly less than and slightly greater than each vertical asymptote you found in step 2. These values will help you understand the function's behavior around the vertical asymptotes.

By following these steps, you can analyze the function's behavior around its intercepts and vertical asymptotes.

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The equation of the circle with center at (-2, 3) and passing through the point (1, 8) is (x + 2)² + (y - 3)² = 34.

The standard form equation of a circle with center (h, k) and radius r is expressed as:

(x - h)² + (y - k)² = r²

Given that: the center of the circle is (-2, 3) and the circle passes through the point (1, 8).

First, we find the radius of the circle, we can use the distance formula between the center and the point on the circle:

r = √[(x2 - x1)² + (y2 - y1)²]

r = √[(1 - (-2))² + (8 - 3)²]

r = √[3² + 5²]

r = √34

So, the equation of the circle is:

(x - (-2))² + (y - 3)² = (√34)²

Simplifying and expanding the equation, we get:

(x + 2)² + (y - 3)² = 34

Therefore, the equation of the circle is (x + 2)² + (y - 3)² = 34.

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The statement "if a function f is continuous & differentiable at a point c & f' (c) = 0, then c is a local minimum or a local maximum of f" is true.

A function f is continuous at a point c if the limit of the function as x approaches c exists and is equal to the function's value at c. Differentiability at c means the derivative f'(c) exists. If f'(c) = 0, it indicates a critical point.

To determine if it's a local minimum or maximum, we can apply the second derivative test. If f''(c) > 0, it's a local minimum, and if f''(c) < 0, it's a local maximum. If f''(c) = 0, the test is inconclusive, and we need to analyze the function further.

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The statement "if a function f is continuous & differentiable at a point c & f' (c) = 0, then c is a local minimum or a local maximum of f" is true.

A function f is continuous at a point c if the limit of the function as x approaches c exists and is equal to the function's value at c. Differentiability at c means the derivative f'(c) exists. If f'(c) = 0, it indicates a critical point.

To determine if it's a local minimum or maximum, we can apply the second derivative test. If f''(c) > 0, it's a local minimum, and if f''(c) < 0, it's a local maximum. If f''(c) = 0, the test is inconclusive, and we need to analyze the function further.

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The answer to the question for the following equation lim n → [infinity] 1 8 n 5n = lim n → [infinity] eln(y) is that lim n → ∞ (1/(8n^5)) = 0

Given the problem, we need to find the limit as n approaches infinity for the equation: lim n → ∞ (1/(8n^5)).

We'll also need to express this limit in terms of e^(ln(y)).

Let's follow these steps:

1. Write down the given equation: lim n → ∞ (1/(8n^5))

2. Apply the properties of limits: lim n → ∞ (1/n^5) * (1/8)

3. Since 1/8 is a constant, we can rewrite it as lim n → ∞ (1/n^5) * (1/8)

4. Now, find the limit as n approaches infinity for 1/n^5: As n increases, the value of 1/n^5 approaches 0, so lim n → ∞ (1/n^5) = 0.

5. Multiply the limit by the constant: 0 * (1/8) = 0

6. Now, express this limit in terms of e^(ln(y)): Since 0 is our limit, we can write it as e^(ln(0)). However, the natural logarithm of 0 is undefined, so we cannot express the limit in this form.

So, the answer to the question is that lim n → ∞ (1/(8n^5)) = 0, but it cannot be expressed in terms of e^(ln(y)).

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The sampling distribution of the sample mean of the observations on the amount of nitrogen removed by the four buffer strips with widths of 6 feet is the theoretical probability distribution of all possible sample means that could be obtained by randomly selecting samples of size 6 from the population of nitrogen removal observations.

Assuming the sample means are normally distributed, the mean of the sampling distribution of the sample means would be equal to the population mean of nitrogen removal by the buffer strips, while the standard deviation would be equal to the population standard deviation divided by the square root of the sample size.

The Central Limit Theorem states that, as the sample size increases, the sampling distribution of the sample means becomes increasingly normal, regardless of the distribution of the original population. This means that, if we take enough samples of size 6, the distribution of their means will approach a normal distribution.

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Derivative of r(t) =(e^(-t), 8t - t^3, ln(t)) is (-e^(-t), 8 - 3t^2, 1/t).

Explanation: -

The derivative of the given vector function r(t) = (e^(-t), 8t - t^3, ln(t)) first find the derivative for each component separately and the following formulas.

d/dt (e^(t)) = e^(t)

d/dt (x^(n)) = n x^(n-1)

d/dt (ln(t)) = 1/t

1. For the first component by the use of chain rule, e^(-t), take the derivative with respect to t:
d/dt (e^(-t)) = -e^(-t)

2. For the second component, 8t - t^3, take the derivative with respect to t:
d/dt (8t - t^3) = 8 - 3t^2

3. For the third component, ln(t), take the derivative with respect to t:
d/dt (ln(t)) = 1/t

Now, combine the derivatives of each component to form the derivative vector r'(t):
r'(t) = (-e^(-t), 8 - 3t^2, 1/t)

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The required answer is the inverse of J(X0) does not exist.

The Jacobian matrix represents the differential of f at every point where f is differentiable. In detail, if h is a displacement vector represented by a column matrix, the matrix product J(x) ⋅ h is another displacement vector, that is the best linear approximation of the change of f in a neighborhood of x, if f(x) is differentiable at x.

To find the Jacobian matrix J for this initial guess xo of (0,-1), we first need to find the partial derivatives of each equation with respect to x and y:

∂f1/∂x = 0     ∂f1/∂y = 0
∂f2/∂x = 0     ∂f2/∂y = 1

Therefore, the Jacobian matrix J is:

J = [∂f1/∂x ∂f1/∂y; ∂f2/∂x ∂f2/∂y] = [0 0; 0 1]

Next, to find J(20), we simply substitute x=20 and y=20 into the Jacobian matrix:

J(20) = [0 0; 0 1]

Finally, we can use Newton's method to find the next iteration X1:

X1 = X0 - J(X0)^(-1) * F(X0)

where X0 is the initial guess, J(X0) is the Jacobian matrix at X0, and F(X0) is the function evaluated at X0.

Plugging in the values we have:

X0 = (0,-1)
J(X0) = [0 0; 0 1]
F(X0) = [2 + 6; 5.23 + (-1) - 5] = [8; 0.23]

Now, we need to find the inverse of J(X0):

J(X0)^(-1) = [1/0 0; 0 1/1] = [undefined 0; 0 1]

Since the inverse of J(X0) does not exist, we cannot proceed with one iteration of Newton's method.
The given nonlinear system of equations is not written correctly. Please provide the correct system of equations, including the variables, so I can help you find the Jacobian matrix and apply Newton's method.

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The statement "The shape of a sampling distribution of sample means that follows the requirements of the central limit theorem will be approximately bell-shaped" is true.

The central limit theorem states that as the sample size increases, the distribution of sample means approaches a normal distribution. This normal distribution is approximately bell-shaped. Therefore, the shape of a sampling distribution of sample means that follows the requirements of the central limit theorem will be approximately bell-shaped.

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Answer:

To find the perimeter of a rectangle, we add the lengths of all four sides. In this case, the rectangle is 3/4 yard long and 3 yards wide, so we can find its perimeter as follows:

Perimeter = 2 × length + 2 × width

Perimeter = 2 × (3/4) yards + 2 × 3 yards

Perimeter = 1.5 yards + 6 yards

Perimeter = 7.5 yards

Therefore, the perimeter of the rectangle is 7.5 yards.

To find the area of a rectangle, we multiply the length by the width. In this case, we have:

Area = length × width

Area = (3/4) yards × 3 yards

Area = 2.25 square yards

Therefore, the area of the rectangle is 2.25 square yards.

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Answer:

--------------------------

Given x-values in the table.

Use the equation of the function to find the corresponding y-values:

When x = - 27:

When x = 0:

When x = 27:

So the missing numbers are: - 3, 0 and 3.

The matching choice is B.

When x=-5, dy/dt = -700 and  When x=2, dy/dt = 0.

To find dy/dt when x=-5, we first need to differentiate y with respect to t using the chain rule:

dy/dt = (dy/dx) * (dx/dt)

Using the power rule and product rule for differentiation, we can find:

dy/dx = 6[tex]x^{2}[/tex] + 2x
dx/dt = -5 (since x is given as -5)

Substituting these values into the chain rule equation, we get:

dy/dt = (6(-5[tex])^{2}[/tex] + 2(-5)) * (-5) = -700

Therefore, when x=-5, dy/dt = -700.

To find dy/dt when x=2, we can use the same method:

dy/dx = 6[tex]x^{2}[/tex] + 2x
dx/dt = 0 (since x is constant)

Substituting these values into the chain rule equation, we get:

dy/dt = (6(2[tex])^{2}[/tex] + 2(2)) * 0 = 0

Therefore, when x=2, dy/dt = 0.

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Answer:

d. Missing x:2 Missing y:5

Step-by-step explanation:

To determine the missing data values, we need to first determine the equation of the linear function that represents the given data. We can use the two given data points (x=0, y=3) and (x=-1, y=2) to find the slope of the function:

slope = (y2 - y1) / (x2 - x1) = (2 - 3) / (-1 - 0) = -1

Next, we can use the point-slope form of a linear equation to find the y-intercept of the function:

y - y1 = m(x - x1)

y - 3 = -1(x - 0)

y - 3 = -x

y = -x + 3

Using this equation, we can determine the missing data values:

When x=4, y = -4 + 3 = -1.

When x=2, y = -2 + 3 = 1.

Therefore, the correct option is:

d. Missing x:2 Missing y:5

The signal has a fundamental period of 6 and contains exclusively odd harmonics (n = 1, 3, 5,...).

A periodic signal is one that repeats the same pattern or sequence of values over a set period of time, referred to as the period or duration of one cycle.

The given signal is:

f(t) = 3sin(t) + 2sin(3t)

To determine whether this signal is periodic or aperiodic, we need to check whether it repeats itself after a certain time interval.

For a signal to be periodic, there must be a value T such that:

f(t) = f(t+T)   for all t

Let's first consider the first term of the signal: 3sin(t). This term is a sinusoidal function with a period of 2π. That is, it repeats itself every 2π units of t.

Now let's consider the second term of the signal: 2sin(3t). This term is also a sinusoidal function, but with a period of 2π/3. That is, it repeats itself every 2π/3 units of t.

To check whether the sum of these two terms is periodic, we need to find the smallest value of T for which the two terms will repeat themselves simultaneously. This is known as the fundamental period.

The fundamental period of a sum of two sinusoidal functions with different periods is given by the least common multiple (LCM) of the individual periods.

In this case, the individual periods are 2π and 2π/3. The LCM of these periods is:

LCM(2π, 2π/3) = 6π

Therefore, the fundamental period of the signal is 6π.

Since the signal is periodic, we can write it as a Fourier series:

f(t) = a0/2 + ∑(n=1 to infinity) [an*cos(nωt) + bn*sin(nωt)]

where:

ω = 2π/T = π/3   (fundamental angular frequency)

an = (2/T) ∫(0 to T) f(t)*cos(nωt) dt

bn = (2/T) ∫(0 to T) f(t)*sin(nωt) dt

Using the formulae for an and bn, we can calculate the coefficients of the Fourier series:

a0 = (1/T) ∫(0 to T) f(t) dt = 0   (since f(t) is odd)

an = (2/T) ∫(0 to T) f(t)*cos(nωt) dt = 0

bn = (2/T) ∫(0 to T) f(t)*sin(nωt) dt =

    (2/6π) ∫(0 to 6π) [3sin(t) + 2sin(3t)]*sin(nωt) dt

Evaluating this integral, we get:

bn = [tex](2/π) [(-1)^{n-1} + (1/3)(-1)^{n-1}][/tex]

Therefore, the Fourier series of the signal is:

f(t) = ∑(n=1 to infinity) [(2/π) [(-1)^n-1 + (1/3)(-1)^n-1]]*sin(nπt/3)

So, the signal is periodic with a fundamental period of 6π, and it contains only odd harmonics (n = 1, 3, 5, ...).

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The sum of the geometric series 4 + 3 + 9/4 + 27/16 +...  is 16.

To find the sum of the given geometric series, we need to determine the common ratio (r) and the first term (a).

We can see that each term of the series is obtained by multiplying the previous term by 3/4. Therefore, the common ratio is 3/4.

The first term (a) is 4.

Using the formula for the sum of a finite geometric series, we can find the sum of the first n terms of the series

Sn = a(1 - r^n) / (1 - r)

Substituting the values of a and r, we get

Sn = 4(1 - (3/4)^n) / (1 - 3/4)

Simplifying the expression

Sn = 16(1 - (3/4)^n)

Since this is an infinite geometric series (the ratio r is less than 1), the sum of the series can be found by taking the limit as n approaches infinity

S = [tex]\lim_{n \to \infty}[/tex] 16(1 - (3/4)^n)

S = 16(1 - 0) = 16

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The given question is incomplete, the complete question is:

Find the sum of the geometric series  4 + 3 + 9/4 + 27/16 +...

The values of a and b given vectors are a = 4 and b = 8.

for a set of vectors to be orthogonal, the dot product of any two distinct vectors in the set should be zero.

Let's check if this condition is satisfied for the given vectors:

u_1 • u_2 = (2)(4) + (1)(-5) + (-1)(3) = 8 - 5 - 3 = 0

u_1 • u_3 = (2)(2) + (1)(a) + (-1)(b) = 4 + a - b

u_2 • u_3 = (4)(2) + (-5)(a) + (3)(b) = 8 - 5a + 3b

We need to find values of a and b such that u_1, u_2, and u_3 form an orthogonal set. So we need u_1 • u_3 = 0 and u_2 • u_3 = 0.

u_1 • u_3 = 4 + a - b = 0, so a - b = -4 ...(1)

u_2 • u_3 = 8 - 5a + 3b = 0, so 5a - 3b = 8 ...(2)

We now have two equations in two variables (a and b). Solving these equations simultaneously, we get:

a = 4, b = 8

Substituting these values back into the dot products, we can check that u_1, u_2, and u_3 form an orthogonal set:

u_1 • u_2 = 0

u_1 • u_3 = 4 + 4 - 8 = 0

u_2 • u_3 = 8 - 20 + 24 = 0

Therefore, the values of a and b that make u_1, u_2, and u_3 an orthogonal set are a = 4 and b = 8.

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TRAP is a trapezoid. as slope of TR = slope of AP.

We have,

T(-1,1), R(3,4), A (7,2), and P(-1,-4).

We know that the trapezium have two parallel side and the parallel lines have same slope.

So, the slope for line TR

m = (4 - 1) / (3-(-1))

m = 3 / 4

and, the slope of AP

m = (-4-2) / (-1 -7)

m = -6 / (-8)

m= 3/4

As, the slope of TR = slope of AP.

Thus, TRAP is a trapezoid.

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For considering a figure present in above figure, the area of shaded region of right angled triangle is equals to the 20 km². So, option(b) is right one.

The area of the shaded region is calculated by the difference between the area of the entire polygon and the area of the unshaded part inside the polygon.

We have a figure present in above figure. It consists two parts one is shaded and non-shaded. It looks like a right angled triangle with angle B is 90°. In case of right angled ∆ABC,

Length of base of triangle, BC = 10 km

Height of triangle, AB = 8 km

In case smaller right angled triangle,

∆ABD, Length of base, BD = 5 km

Length of prependicular, AB = 8 km

We have to determine the area of shaded part. Using above definition, area of shaded part of figure= area of larger right angled triangle - area of smaller right angled triangle

= area( ∆ABC) - area( ∆ABD)

[tex]= \frac{ 1}{2}AB×BC - \frac{ 1}{2}AB×BD \\ [/tex]

=> [tex] = \frac{ 1}{2}×10 ×8 - \frac{ 1}{2}×8× 5[/tex]

= 20.

Hence, required value is 20 square km.

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Complete question:

The above figure complete the question.

What is the area of the shaded region?

a) 20 km²

b) 12 km²

The volume of the cone with a height of 9 inches and a diameter of 14 inches is 147π cubic inches. So, the correct answer is D).

To calculate the volume of a cone, we use the formula

V = (1/3)πr²h

where "r" is the radius of the base and "h" is the height of the cone.

In this problem, we are given the diameter of the base, which is 14 inches. To find the radius, we divide the diameter by 2

r = 14/2 = 7 inches

We are also given the height, which is 9 inches.

Now we can substitute these values into the formula

V = (1/3)π(7²)(9)

V = (1/3)π(49)(9)

V = (1/3)(441π)

V = 147π

So the volume of the cone is 147π cubic inches.

So the answer is option (D) 147π.

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The derivative value of dy for the given values of x and dx. y = x 1 x − 1 , x = 2, dx = 0.05 is -0.05.

The given function is y = x/(x-1). We need to find dy when x = 2 and dx = 0.05.

First, we find the derivative of the function with respect to x using the quotient rule:

y' = [(x-1)(1) - x(1)] / (x-1)²

= -1 / (x-1)²

Next, we substitute x = 2 into the derivative expression to get the slope of the tangent line at x = 2:

y' = -1 / (2-1)² = -1

This means that for every 1 unit increase in x, y decreases by 1 unit. So when dx = 0.05, the change in y is:

dy = y' × dx = (-1) × 0.05 = -0.05

Therefore, when x = 2 and dx = 0.05, the value of dy is -0.05. The main mathematics topic used here is calculus, specifically the quotient rule and finding the derivative.

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The derivative value of dy for the given values of x and dx. y = x 1 x − 1 , x = 2, dx = 0.05 is -0.05.

The given function is y = x/(x-1). We need to find dy when x = 2 and dx = 0.05.

First, we find the derivative of the function with respect to x using the quotient rule:

y' = [(x-1)(1) - x(1)] / (x-1)²

= -1 / (x-1)²

Next, we substitute x = 2 into the derivative expression to get the slope of the tangent line at x = 2:

y' = -1 / (2-1)² = -1

This means that for every 1 unit increase in x, y decreases by 1 unit. So when dx = 0.05, the change in y is:

dy = y' × dx = (-1) × 0.05 = -0.05

Therefore, when x = 2 and dx = 0.05, the value of dy is -0.05. The main mathematics topic used here is calculus, specifically the quotient rule and finding the derivative.

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