In 2020 Ashmija invested $10,000 into an account which is growing at 4.5% annually.

Write an equation to model the amount of money in her account D(t), with respect to time, t. Explain what the values represent. [4 Marks]

Use your equation to find how much she will make in 2050 assuming she hasn't made any withdrawals or extra deposits. [3 marks]

The solution to the given differential equation with the given initial conditions is r(t) = (1/50)(e^5t - 5t^2 + 10t + 1923)i + (1/5)tj + (1/2)t + 69k.

The given differential equation is a second-order differential equation in vector form. To solve this equation, we need to integrate it twice. The first integration gives us the velocity vector r'(t), and the second integration gives us the position vector r(t).

We can start by integrating the given acceleration vector to obtain the velocity vector r'(t):

r'(t) = (1/10)(e^5t - 5t^2 + 10t + C1)i + (1/5)t + C2j + (1/2)t + C3k

We can use the initial condition r'(1) = (9,0,0) to find the values of C1, C2, and C3. Substituting t = 1 and equating the components, we get:

C1 = 55, C2 = 0, C3 = -68

Now we can integrate the velocity vector r'(t) to obtain the position vector r(t):

r(t) = (1/50)(e^5t - 5t^2 + 10t + 1923)i + (1/5)tj + (1/2)t + 69k

Using the initial condition r(1) = (0,0,7), we can find the value of the constant of integration:

C4 = (0,0,-69)

Thus, the solution to the given differential equation with the given initial conditions is r(t) = (1/50)(e^5t - 5t^2 + 10t + 1923)i + (1/5)tj + (1/2)t + 69k.

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The emotional high point or climax for Tom Ripley in the novel can be seen as the moment when his true nature is exposed and his web of lies begins to unravel.

The main conflict in the book "The Talented Mr. Ripley" by Patricia Highsmith revolves around the protagonist, Tom Ripley, who is a skilled imposter and manipulator. The story follows Tom's efforts to assume the identity of Dickie Greenleaf, a wealthy and privileged young man. As Tom becomes more entangled in his deception, he struggles to maintain his façade and keep his true identity hidden, while also dealing with the psychological toll of his actions.

In terms of a symbol that could represent the title, one possible choice could be a mask or a mirror. A mask represents the idea of hiding one's true self behind a false persona, which is a central theme in the novel. Tom Ripley constantly presents himself as someone he is not, wearing a metaphorical mask to deceive others and gain their trust. Similarly, a mirror could symbolize the self-reflection and introspection that Tom experiences throughout the story as he grapples with his own identity and desires.

The emotional high point or climax for Tom Ripley in the novel can be seen as the moment when his true nature is exposed and his web of lies begins to unravel. Without revealing too many details to avoid spoilers, this occurs when certain characters become suspicious of Tom and start questioning his true motives and intentions. The climax is marked by a heightened sense of tension and danger, as Tom's carefully constructed world begins to crumble around him, leading to a dramatic and pivotal turning point in the narrative.

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Assuming that the nominal size of the square hole is referring to the diameter of the smallest circle that can fully enclose the square, the maximum size of the square hole would be approximately 0.177 inches (or 4.5 millimeters).

This is calculated by taking the nominal size (0.25) and multiplying it by the square root of 2 (approximately 1.414), and then subtracting that result from the nominal size.

Therefore, the maximum size of the square hole would be 0.25 - (0.25 x 1.414) = 0.177 inches (or 4.5 millimeters).

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The boolean expressions that evaluate to false are b) 1 == 0 and e) false.

a) 8 <= 4: This expression compares the values of 8 and 4. Since 8 is not less than or equal to 4, this expression evaluates to false.

b) 1 == 0: This expression checks whether 1 is equal to 0. Since 1 is not equal to 0, this expression evaluates to false.

c) (5 - 2) == (10 - 7): This expression compares the result of subtracting 2 from 5 with the result of subtracting 7 from 10. Since both subtractions yield 3, the expression evaluates to true.

d) (true and true) or: This expression combines the logical AND operation between two true values and then performs the logical OR operation with an unspecified value. Without the second operand, the expression is incomplete and cannot be evaluated.

e) false: This expression directly evaluates to false since false is a boolean literal.

Therefore, the boolean expressions that evaluate to false are b) 1 == 0 and e) false.

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The cost of points for this mortgage, rounded to the nearest dollar is $6,630.

The cost of points for this mortgage, rounded to the nearest dollar is $6,630.What are Points?In order to reduce the interest rate on their mortgage, some lenders allow borrowers to pay extra upfront fees known as discount points, or mortgage points.

The cost of one point is equal to one percent of the loan amount, and it can reduce the interest rate by a quarter to half a percentage point.

Therefore, in this problem, the cost of one point would be equal to

156,000 x 0.0025 = 390. Since the bank is offering a 4.25% interest rate if Julie pays 2.25 points, the cost of points would be

390 x 2.25 = 877.50.

To round the answer to the nearest dollar, we have to add 0.5 cents to the amount, then round it to the nearest dollar.

Thus, the cost of points for this mortgage rounded to the nearest dollar is $878 x 7.54 = $6,630.

Therefore, the cost of points for this mortgage, rounded to the nearest dollar is $6,630.

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The cross section would be a circular sphere and a cylinder

A cylinder is defined as a shape that has there dimensional surface that is made up of two circles and a curved area.

The two flat circular bases are congruent to each other and It does not have any vertex.

A circular sphere is defined as a round object found in a space which is equally a three dimensional object.

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An algorithm is a set of instructions or rules designed to solve a particular problem or achieve a specific goal. In the case of finding the minimum spanning tree (MST) of a weighted undirected graph, two popular algorithms are Kruskal's algorithm and Prim's algorithm.

Kruskal's algorithm works by selecting the lowest cost edges that do not form any cycle, until all vertices are connected in a single MST. It starts by sorting all the edges in non-decreasing order of their weights. Then, it considers each edge one by one and adds it to the MST if it does not create a cycle. A disjoint-set data structure is used to keep track of the connected components of the graph.

On the other hand, Prim's algorithm works by starting from an arbitrary vertex and gradually adding the lowest cost edges that connect the MST to the remaining vertices. It maintains a set of visited vertices and a priority queue of the edges that connect them to the unvisited vertices. At each step, it selects the edge with the lowest weight and adds its endpoint to the visited set. Then, it updates the priority queue by adding the edges that connect the new vertex to the unvisited vertices.

Both algorithms guarantee to find the same MST for any given weighted undirected graph. However, Kruskal's algorithm is generally faster and easier to implement, especially for sparse graphs. Prim's algorithm has the advantage of being more efficient for dense graphs, as it avoids considering all the edges.

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The calculated area of the triangle is 12.74 square cm

from the question, we have the following parameters that can be used in our computation:

The triangle where we have

The area of the triangle is then calculated as

Area = 1/2 * base * height

So, we have

Area = 1/2 * base * height

Substitute the known values in the above equation, so, we have the following representation

Area = 1/2 * 9.8 * 2.6

Evaluate

Area = 12.74

Hence, the area of the triangle is 12.74 square cm

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In an AD/AS model, real GDP is shown on the horizontal axis. The correct answer is option 4.

Real GDP is commonly represented on the horizontal axis in an AD/AS model. Real GDP represents the total value of goods and services produced in an economy, adjusted for inflation. It is a measure of economic output or income.

The horizontal axis in an AD/AS model typically reflects the level of real GDP or the level of aggregate output in the economy. Real GDP is often used to analyze the relationship between aggregate demand and aggregate supply.

The GDP deflator does not always slope upwards. The GDP deflator is a measure of the overall price level in an economy, calculated by dividing nominal GDP by real GDP.

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The series is absolutely convergent.

To determine the convergence of the series, we can compare it with the corresponding p-series. Let's consider the series:

[tex]\frac{\sum(-1)^n (arctan(n)}{ (n^{13})}[/tex] where n starts from 1 and goes to infinity.

We know that [tex]|\frac{(-1)^n arctan(n) }{ n^{13}}| < \frac{1}{n^{13}}[/tex] for all n.

Now, we compare it with the corresponding p-series:

[tex]\frac{\sum1}{n^{p}}[/tex]

In our case, p = 13.

For a p-series, the series is absolutely convergent if p > 1, conditionally convergent if 0 < p ≤ 1, and divergent if p ≤ 0.

Since p = 13 > 1, the corresponding p-series [tex]\frac{\sum1}{n^{13}}[/tex] converges absolutely.

Now, let's analyze the series [tex]\frac{\sum(-1)^n (arctan(n) }{ n^{13})}[/tex]:

We know that the terms of the series are bounded by the corresponding terms of the absolute value series, which is [tex]\frac{1}{n^{13}}[/tex].

Since [tex]\frac{\sum1}{n^{13}}[/tex] converges absolutely, by the comparison test, we can conclude that [tex]\frac{\sum(-1)^n (arctan(n)}{ n^{13})}[/tex] also converges absolutely.

Therefore, the series [tex]\frac{\sum(-1)^n (arctan(n)}{ n^{13})}[/tex] is absolutely convergent.

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Answer:

height = 4 feet

Step-by-step explanation:

A storage bin is usually in the shape of a rectangular box and the formula for volume of a rectangular box is:

V = lwh, where

Since we know that the student wants the volume of the storage bin to be 168 ft^3 and has already found that the length and width are 7 and 6 ft respectively, we can plug in 168 for V, 7 for l, and 6 for w, allowing us to solve for h, the height of the storage bun:

168 = 7 * 6 * h

168 = 42h

4 = h

Thus, the height of the storage bin must be 4 feet tall, in order for its volume to be 168 ft^3, given that the length is 7 ft and the width is 6 ft.

The cutoff of 100.6°F may be too low. The minimum temperature for requiring further medical tests should be approximately 100.82°F.

a. To determine the percentage of normal and healthy persons considered to have a fever, we need to calculate the proportion of temperatures exceeding 100.6°F. We can use the normal distribution with the given mean of 98.23°F and standard deviation of 0.64°F. By calculating the area under the normal curve to the right of 100.6°F, we find that approximately 3.72% of individuals would be considered to have a fever. This relatively low percentage suggests that the cutoff of 100.6°F may classify too many healthy individuals as having a fever.

b. To find the temperature that would result in only 5.0% of healthy people exceeding it, we need to determine the cutoff temperature. We want to find the temperature value that corresponds to the upper 5.0% of the distribution. Using the normal distribution and the cumulative probability function, we find the corresponding z-score that has an area of 0.05 in the upper tail. Converting this z-score back to the temperature scale using the mean and standard deviation, we find that the minimum temperature for requiring further medical tests should be approximately 100.82°F. This would help minimize false positive results, where the test indicates sickness when the subject is actually healthy.

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Let's first calculate the new average speed when John Short travels at 50mph speed.Let's use the formula:average speed = distance / time, which is 50mph.

We know that distance remains the same (36 miles) at different speeds, but time will change as speed changes.

Therefore, the new time can be calculated as:time = distance / average speedNew time for 50 mph is:time = 36 / 50 = 0.72 hours

Now, let's calculate the new distance that can be traveled on 1 gallon of fuel.

We know that the new average speed is 50mph. Therefore, the new fuel economy can be calculated as:fuel economy = distance / fuel used

We also know that fuel used will decrease by 25% when speed increases from 40 mph to 50 mph. Therefore, the new fuel used can be calculated as:fuel used = 0.75 * fuel used at 40 mphUsing the above formula and the given values, we can calculate the new fuel used:fuel used = 0.75 * 1 = 0.75 gallonsNow, we can calculate the new distance that can be traveled on 1 gallon of fuel as:fuel economy = distance / fuel used36 = distance / 0.75distance = 36 * 0.75 = 27Therefore, John Short can expect to travel 27 miles per gallon at an average speed of 50mph.

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Our estimate for the total number of people in the village who are older than 60 but not older than 80 is 96.

To estimate the total number of people in the village who are older than 60 but not older than 80, we need to use the information we have about the 50 people whose ages were recorded.

Let's assume that this sample of 50 people is representative of the entire village.
According to the table, there are 12 people who are older than 60 but not older than 80 in the sample.

To estimate the total number of people in the village who fall into this age range, we can use the following proportion:
(12/50) = (x/400)
where x is the total number of people in the village who are older than 60 but not older than 80.
Solving for x, we get:
x = (12/50) * 400 = 96.

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The critical F value with 2 numerator and 40 denominator degrees of freedom at a = 0.05 is 3.15.

To find the critical F value, we need to use an F distribution table or calculator. We have 2 numerator degrees of freedom and 40 denominator degrees of freedom with a significance level of 0.05.

From the F distribution table, we can find the critical F value of 3.15 where the area to the right of this value is 0.05. This means that if our calculated F value is greater than 3.15, we can reject the null hypothesis at a 0.05 significance level.

Therefore, we can conclude that the critical F value with 2 numerator and 40 denominator degrees of freedom at a = 0.05 is 3.15.

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By splitting the composite figure to rectangles, triangles and semicircle and adding their areas we find the area of shape

The given shape is a composite figure

We draw a line at the above and the bottom of the curve

Which splits the figure to have two right angled triangles, two rectangle and one semicircle

The area of triangle is half times base times height

The area of rectangle is kength times width

The area of circle is 1/2pi times r square

By using these formula we find all the areas and combine the areas to find the total area

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For the dice problem, the support Sx of X (sum of numbers on blue and red dice) is the set of all possible sums, which ranges from 2 (rolling a 1 on both dice) to 12 (rolling a 6 on both dice).

a)Sx = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}.

b) Sx = {0, 1, 2, ..., 2,265}. c) Sx = {1,500, 1,501, ..., 2,000}. di)Sx = {0, 200, 1000}. dii) Sx = {-10, 190, 990}.diii) Sx = {-20, 170, 960, 1170}.

(a) For the dice problem, the support Sx of X (sum of numbers on blue and red dice) is the set of all possible sums, which ranges from 2 (rolling a 1 on both dice) to 12 (rolling a 6 on both dice). So, Sx = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}.

(b) For the concert, the support Sx of X (number of audience members attending) ranges from 0 (no audience members) to the maximum capacity of 2,265. So, Sx = {0, 1, 2, ..., 2,265}.

(c) For the BASE jumper, the support Sx of X (altitude) ranges from the starting altitude of 2000 meters to the landing altitude of 1500 meters. So, Sx = {1,500, 1,501, ..., 2,000}.

(d.i) For the participant who bought one ticket, the revenue X can be either $0 (no prize), $1000, or $200. So, Sx = {0, 200, 1000}.

(d.ii) For the participant who bought one ticket, the net profit X can be either -$10 (no prize), $190 (winning a $200 prize), or $990 (winning the $1000 prize). So, Sx = {-10, 190, 990}.

(d.iii) For the participant who bought two tickets, the net profit X can be -$20 (no prize), $170 (winning one $200 prize), $960 (winning one $1000 prize), or $1170 (winning both the $1000 and a $200 prize). So, Sx = {-20, 170, 960, 1170}.

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The discriminant D is -60, and the type of the conic section is an ellipse.

To use the Discriminant Test for the conic section defined by the equation 6x² + 6xy + 4y² = 16, compare the equation with Ax² + Bxy + Cy²=T

we need to compute the discriminant D using the following formula:

D = B² - 4AC

where A = 6, B = 6, and C = 4.

D = (6)² - 4(6)(4)
D = 36 - 96
D = -60

Since D is negative, the conic section is an ellipse.

The discriminant D is -60, and the type of the conic section is an ellipse.

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a) A and B are not independent events B) A and B are not mutually exclusive events C) the probability that neither A nor B takes place is 0.80

Using probability formula:

a. To determine if A and B are independent events, we need to check if P(A) * P(B) = P(A ∩ B).

P(A) = 0.15
P(B) = 0.10
P(A ∩ B) = 0.05

Calculate P(A) * P(B):
0.15 * 0.10 = 0.015

Since 0.015 ≠ 0.05, A and B are not independent events.

b. To determine if A and B are mutually exclusive events, we need to check if P(A ∩ B) = 0.

P(A ∩ B) = 0.05

Since 0.05 ≠ 0, A and B are not mutually exclusive events.

c. To find the probability that neither A nor B takes place, we can use the formula:

P(A' ∩ B') = 1 - P(A ∪ B)

To find P(A ∪ B), use the formula:

P(A ∪ B) = P(A) + P(B) - P(A ∩ B)

Calculate P(A ∪ B):
0.15 + 0.10 - 0.05 = 0.20

Now calculate P(A' ∩ B'):
1 - 0.20 = 0.80

So, the probability that neither A nor B takes place is 0.80.

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Let's denote the cost of each pendant as "x."

The total cost of the beads and pendants for all 4 necklaces is $16.80. Since the cost of the beads for each necklace is $2.30, we can subtract the total cost of the beads from the total cost to find the cost of the pendants.

Total cost - Total bead cost = Total pendant cost

$16.80 - ($2.30 × 4) = Total pendant cost

$16.80 - $9.20 = Total pendant cost

$7.60 = Total pendant cost

Since Keiko made 4 identical necklaces, the total cost of the pendants is distributed equally among the necklaces.

Total pendant cost ÷ Number of necklaces = Cost of each pendant

$7.60 ÷ 4 = Cost of each pendant

$1.90 = Cost of each pendant

Therefore, each pendant costs $1.90.

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A stem-and-leaf plot organizes data by showing the digits of each number. The stem is the leftmost digit or digits of the number, while the leaf is the rightmost digit. Here is the stem-and-leaf plot for the ages at inauguration of the first 44 U.S. presidents:

4 | 2

4 | 3

4 | 6 6

4 | 7 8

5 | 0 1 1 1 2 2 2 4 4 5 5 5 5 5 5 6 6 7

5 | 1 1 2 4 5 5 5 6 6 6 7 7 8

6 | 0 1 2 4 4 4 5 8 9

Each stem represents a tens digit, and the leaves represent the ones digits. For example, the first line shows that there are two presidents whose age at inauguration was 42 years old. The second line shows that there are three presidents whose age at inauguration was 43 years old. The third line shows that there were two presidents whose age at inauguration was 46 years old, and so on.

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The integral of f(x, y, z) over the curve c(t) is (6π + (2/3)π³) × √2.

To calculate the integral of f(x,y,z) = 6x²+6y²+z² over the curve c(t) = (cos(t), sin(t), t) for 0 ≤ t ≤ π, we first find the derivative of c(t) to determine the velocity vector, v(t):
v(t) = (-sin(t), cos(t), 1)
Next, we compute the magnitude of v(t):
||v(t)|| = √((-sin(t))² + (cos(t))² + 1²) = √(1 + 1) = √2
Now, substitute x = cos(t), y = sin(t), and z = t into the function f(x, y, z):
f(c(t)) = 6(cos(t))² + 6(sin(t))² + t²
Finally, integrate f(c(t)) multiplied by the magnitude of v(t) with respect to t from 0 to π:
∫₀[tex]{^\pi }[/tex] (6(cos(t))² + 6(sin(t))² + t²) × √2 dt
This integral evaluates to:
(6π + (2/3)π³) × √2

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The linear function that fits the data points is f(t) = 1.5 + 1.5t.

To fit a linear function of the form f(t)=c0+c1t to the data points (-6,0), (0,3), and (6,12) using least squares, we can follow the following steps:

Step 1: Write the linear function in matrix form.

The equation for the linear function in matrix form is:

Y = Xβ + ε

where,

Y = [0, 3, 12]T

X = [1, -6; 1, 0; 1, 6]

β = [c0; c1]

ε = error vector

Step 2: Calculate the coefficient matrix β that minimizes the sum of squares of errors between the predicted values and the actual values.

The coefficient matrix β can be calculated as:

β = (XTX)-1XTY

where,

XT = transpose of X

(XTX)-1 = inverse of (XTX)

XTY = dot product of XT and Y

After calculating β, we get β = [1.5, 1.5]T

Therefore, the linear function that fits the data points is:

f(t) = 1.5 + 1.5t

Step 3: Plot the data points and the fitted line to visualize the fit.

The plot of the data points and the fitted line is shown below:

import matplotlib.pyplot as plt

import numpy as np

t = np.array([-6, 0, 6])

f = np.array([0, 3, 12])

c = np.polyfit(t, f, 1)

plt.plot(t, f, 'o', label='data points')

plt.plot(t, np.polyval(c, t), label='fitted line')

plt.legend()

plt.show()

In summary, we have used the least squares method to fit a linear function to the given data points (-6,0), (0,3), and (6,12).

This method helps to find the coefficients of the linear function that minimize the sum of the squares of the errors between the predicted values and the actual values.

The resulting linear function that fits the data points is f(t) = 1.5 + 1.5t, which is shown to be a good fit to the data points in the plot.

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The standard form of √126 + √56 is 5√14.

To find the square root of 126 and 56, we can factor each number into their prime factors:
126 = 2 x 3 x 3 x 7
56 = 2 x 2 x 2 x 7

Then, we can simplify the square roots by pairing up the prime factors that appear in pairs:
√126 = √(2 x 3 x 3 x 7) = 3√14
√56 = √(2 x 2 x 2 x 7) = 2√14

Now, we can add the two simplified square roots:
√126 + √56 = 3√14 + 2√14 = (3 + 2)√14 = 5√14

Therefore, the standard form of √126 + √56 is 5√14.

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The determinant of the coefficient matrix of the given system is 5.

We need to find the determinant of the coefficient matrix of the system given below:

-x - y - z = 3

-x - y - z = 8

3x + 2y + z = 0

The coefficient matrix of the system is given by the following matrix:

[-1 -1 -1]

[-1 -1 -1]

[ 3  2  1]

Now, let's find the determinant of the above matrix:

|A| = -1 * [( -1 * 1 ) - (-1 * 2)] - (-1) * [(-1 * 1) - (3 * 2)] + 1 * [(-1 * 2) - (3 * 1)]

|A| = -1 * (-1 - 2) - (-1) * (-1 - 6) + 1 * (-2 - 3)

|A| = -1 * (-3) - (-1) * (-7) + 1 * (-5)

|A| = 3 + 7 - 5

|A| = 5

Hence, the determinant of the coefficient matrix of the given system is 5.

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A. The average cost per frame if 100 frames are produced is $1,300.

B. The marginal average cost is $900 per frame.

C. The estimated average cost per frame if 101 frames are produced is $2,200.

(A) To find the average cost per unit if 100 frames are produced, we need to divide the total cost by the number of units produced.

C(x) = 40,000 + 900x
C(100) = 40,000 + 900(100)
C(100) = 130,000

The total cost of producing 100 frames is $130,000.

To find the average cost per frame, we divide the total cost by the number of frames produced:
Average Cost = Total Cost / Number of Frames
Average Cost = $130,000 / 100
Average Cost = $1,300

Therefore, the average cost per frame if 100 frames are produced is $1,300.

(B) To find the marginal average cost at a production level of 100 units, we need to find the derivative of the cost function:

C(x) = 40,000 + 900x
C'(x) = 900

The marginal average cost is the derivative of the cost function, so at a production level of 100 units, the marginal average cost is $900 per frame.

(C) To estimate the average cost per frame if 101 frames are produced, we can use the information from parts (A) and (B).

If the average cost per frame for 100 frames is $1,300, and the marginal average cost at 100 frames is $900, we can estimate the average cost per frame for 101 frames using the formula:
Average Cost = Previous Average Cost + Marginal Average Cost
Average Cost = $1,300 + $900
Average Cost = $2,200

Therefore, the estimated average cost per frame if 101 frames are produced is $2,200.

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The work done by the force F on a particle moving counterclockwise around the closed path C is π([tex]e^4[/tex] − 1).

To use Green's theorem to calculate the work done by the force F on a particle moving counterclockwise around a closed path C, we need to first calculate the curl of F:

curl F = (∂Ey/∂x − ∂(ex−9y)/∂y) k = (2ex − 9)k

where i, j, and k are the unit vectors in the x, y, and z directions, respectively.

Next, we need to parameterize the closed path C. In this case, the path is given by r = 2cos(θ), where θ varies from 0 to 2π. We can parameterize this path as:

x = 2cos(θ)

y = 2sin(θ)

We can then use Green's theorem to calculate the work done by F:

∮C F · dr = ∬R (curl F) · dA

where R is the region enclosed by C and dA is the area element.

Substituting in the values we have calculated, we get:

∮C F · dr = ∬R (2ex − 9)k · dA

The region R is a circle with radius 2, so we can use polar coordinates to evaluate the integral:

∬R (2ex − 9)k · dA = ∫θ=0 2π ∫r=0 2 (2e^(r cosθ) − 9)r dr dθ

Evaluating this integral, we get:

∮C F · dr = π([tex]e^4[/tex] − 1)

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We need to calculate the curl of the force, parameterize the path, and then use Green's theorem to evaluate the line integral to get work done by the force f on a particle that is moving counterclockwise around the closed path c.

To apply Green's theorem to calculate the work done by the force F on a particle moving counterclockwise around a closed path C, we first need to calculate the curl of F. We have:

curl F = (∂Ey/∂x − ∂(ex−9y)/∂y) k

= (2ex − 9)k

where k is the unit vector in the z direction.

Next, we need to parameterize the closed path C. In this case, the path is given by r = 2cos(θ), where θ varies from 0 to 2π. We can parameterize this path as:

x = 2cos(θ)

y = 2sin(θ)

We can then use Green's theorem to calculate the work done by F:

∮C F · dr = ∬R (curl F) · dA

where R is the region enclosed by C and dA is the area element.

Substituting the values we have calculated, we get:

∮C F · dr = ∬R (2ex − 9)k · dA

The region R is a circle with a radius of 2, so we can use polar coordinates to evaluate the integral:

∬R (2ex − 9)k · dA = ∫θ=0 2π ∫r=0 2 (2e^(r cosθ) − 9)r dr dθ

Evaluating this integral, we get:

∮C F · dr = π( − 1)

Therefore, the work done by the force F on a particle moving counterclockwise around the closed path C is π( − 1).

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The price of a First-Class stamp in 2021 was 4.46 times as great as the price of Tubman's stamp.

The price of Harriet Tubman's First-Class stamp was 13 cents.

In 2021, the price of a First-Class stamp was $0.58.

We can determine how many times as great the price of a First-Class stamp in 2021 was than Tubman's stamp by dividing the price of a First-Class stamp in 2021 by the price of Tubman's stamp.

So, 0.58/0.13

= 4.46 (rounded to two decimal places)

Thus, the price of a First-Class stamp in 2021 was 4.46 times as great as the price of Tubman's stamp.

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To prove the property ez2 = ez2 . 5, we first used the definition of the complex exponential function to express ez and ez2 in terms of x and y. Next, we substituted z = x + iy and z/2 = x/2 + i(y/2) to simplify the expressions. Finally, we showed that ez2 and ez2.5 are equal by multiplying ez2.5 by itself and obtaining the same result as ez2.

To prove the property ez2 = ez2 . 5, we can start by using the definition of the complex exponential function:

ez = e^(x+iy) = e^x * e^(iy) = e^x * (cos(y) + i*sin(y))

Then, we can square this expression:

ez2 = (e^x * (cos(y) + i*sin(y)))^2
   = e^(2x) * (cos^2(y) - sin^2(y) + 2i*sin(y)*cos(y))

Next, we can substitute z = x + iy, and z/2 = x/2 + i(y/2):

ez2 = e^(2z) = e^(2(x+iy)) = e^(2x) * e^(2iy)
   = e^(2x) * (cos(2y) + i*sin(2y))

And:

ez2.5 = e^(2z/2) = e^(z) = e^(x+iy) = e^x * e^(iy)
     = e^x * (cos(y) + i*sin(y))

Now, we can see that:

ez2 = e^(2x) * (cos^2(y) - sin^2(y) + 2i*sin(y)*cos(y))
   = e^(2x) * (cos(2y) + i*sin(2y))

And:

ez2.5 = e^x * (cos(y) + i*sin(y))

If we multiply ez2.5 by itself, we get:

(ez2.5)^2 = e^(2x) * (cos^2(y) + sin^2(y) + 2i*sin(y)*cos(y))
         = e^(2x) * (cos(2y) + i*sin(2y))

Which is exactly the same as ez2. Therefore, we have proven that ez2 = ez2 . 5.

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The Root Test tells us that the series converges

The Root Test is a method used to determine the convergence or divergence of a series with non-negative terms.

Given a series of the form ∑an, we can use the Root Test by considering the limit of the nth root of the absolute value of the terms:

limn→∞n√|an|

If this limit is less than 1, then the series converges absolutely. If the limit is greater than 1, then the series diverges. If the limit is exactly 1, then the test is inconclusive.

In the given problem, we have a series of the form ∑n=1∞(1+1/n)^(-n^2). To apply the Root Test, we need to evaluate the limit:

limn→∞n√|(1+1/n)^(-n^2)|

= limn→∞(1+1/n)^(-n)

= (limn→∞(1+1/n)^n)^(-1)

The limit inside the parentheses is the definition of the number e, so we have:

limn→∞n√|(1+1/n)^(-n^2)| = e^(-1)

Since e^(-1) is less than 1, the Root Test tells us that the series converges absolutely.

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