Find the amount of fencing (ft) needed to enclose a semi-circle having an area of 2.5 km2. Report result to nearest foot.

Answers

Answer 1

Answer:

Step-by-step explanation:

2.807 km × 3280.84 ft/km ≈ 9203.2 ft

Rounding this to the nearest foot, we get:

The amount of fencing needed to enclose the semi-circle is approximately 9203 feet.


Related Questions

Write the expression using only positive exponents. Assume no denominator equals zero.
(-3x^4 y^(-7) )^(-3)
Please show work

Answers

Answer:

[tex]\frac{-3y^{21}}{x^{12}}[/tex]

Step-by-step explanation:

[tex]Given: (-3x^{4}y^{-7})^{-3}\\\\= 3x^{4*-3}y^{-7*-3}\\\\= 3x^{-12}y^{21}\\\\\\[/tex]

Hence we have   [tex]\frac{-3y^{21}}{x^{12}}[/tex]

A six-foot man casts a 15 foot shadow. At the same time a streetlight casts an 80-foot shadow

Answers

After analysing the given data we conclude that the height of the streetlight is 29.4 feet, under the condition that a six-foot man places a 15 foot shadow. At the same time a streetlight casts an 80-foot shadow.

Now Let us consider the height of the streetlight "h".

The given angle of elevation is 52.5 degrees. This projects that the angle between the horizontal line and the line of sight to the top of the streetlight is 52.5 degrees.

We can apply the tangent function to evaluate h. tan(52.5) = h/20.

Evaluating  for h, we get h = 20 × tan(52.5) = 29.4 feet (rounded to one decimal place).

Therefore, the height of the streetlight is approximately 29.4 feet.

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Question

A six-foot man casts a 15 foot shadow. At the same time a streetlight casts an 80-foot shadow.

The same six-foot tall man wants to indirectly measure the streetlight in screen 3. But it is a cloudy day and there are no shadows. So holding his phone by his eye, he uses the "level" feature on the Measure app to sight the top of the streetlight. Standing 20 feet away he finds an angle of elevation of 52.5 degrees.

Write and solve an equation to determine the height of the streetlight.

An amusement park wants to design a roller coaster that rises 60 feet above the ground and then drops the same distance below ground through a tunnel 0 60 a What number on a number line would represent the underground depth? b What number on a number line would represent the height above the ground? c. What number on a number line would the ground represent?​

Answers

Answer:

Step-by-step explanation:

The depth underground would be represented by 260. This integer is the opposite of 60, the

above ground height.

i need help with this​

Answers

a - The lines are parallel

b - The lines perpendicular

c - The lines are perpendicular

When are equations of lines perpendicular or parallel?

Based on their slopes, lines' equations can be categorized as parallel or perpendicular. A line's slope can be used to determine how steep or flat a line is. The slopes of two lines interact to determine whether two lines are parallel, perpendicular, or neither.

We can see that when the slope of the second line is inverse to the slope of the first line then  we can say that the lines are perpendicular but when the slopes are the same, we can say that the lines are parallel.

In a, the slope of tghe first line is 2 and so is the slope of the second line thus they are parallel. In b, the slope of the first line is 3 while the slope of the second line is -1/3 thus they are perpendicular.

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A vet treats dogs (D), cats (C), birds (B), hamsters (H), and reptiles (R). A veterinary assistant randomly selects a patient’s file.


What is the sample space for this experiment?
Responses

S={D, B, H}
S equals left curly bracket D comma B comma H right curly bracket

S={D, C, B, H, R}
S equals left curly bracket D comma C comma B comma H comma R right curly bracket

S={C, B, H, R}
S equals C comma B comma H comma R right curly bracket

S={D}

Answers

Answer:

The sample space for the experiment of randomly selecting a patient's file from the given animals is:

S={D, C, B, H, R}

The sample space includes all the possible outcomes of the experiment, which in this case are the animal types that can be selected by the veterinary assistant. Since the assistant can randomly select a file for any of the five types of animals, the sample space consists of all the possible animal types, which are D (dogs), C (cats), B (birds), H (hamsters), and R (reptiles).

Step-by-step explanation:

write the characteristic equation for a, and solve it to find the eigenvalues of a. list each eigenvalue’s multiplicity

Answers

To write the characteristic equation for matrix a, we first need to find the determinant of the matrix (a-λI), where λ is the eigenvalue and I is the identity matrix. The characteristic equation is then obtained by setting the determinant equal to zero.

Once we have the characteristic equation, we can solve it to find the eigenvalues of a. Each eigenvalue corresponds to a specific solution of the equation. The eigenvalues may be repeated, in which case we refer to their multiplicity.

For example, if the characteristic equation of a is (λ-3)(λ-2)(λ+1) = 0, then the eigenvalues of a are λ1=3, λ2=2, and λ3=-1. The multiplicity of λ1 is 1, the multiplicity of λ2 is also 1, and the multiplicity of λ3 is 1.

The multiplicity of an eigenvalue corresponds to the number of times it appears as a solution to the characteristic equation. If an eigenvalue has a multiplicity of 1, it corresponds to a single eigenvector. If an eigenvalue has a multiplicity greater than 1, it corresponds to multiple linearly independent eigenvectors. The concept of eigenvalues and eigenvectors is fundamental in linear algebra and is used in many applications in engineering, physics, and computer science.
To write the characteristic equation for a matrix A and find its eigenvalues, follow these steps:

1. Set up the equation: det(A - λI) = 0, where λ represents the eigenvalue and I is the identity matrix of the same size as A.
2. Calculate the determinant of (A - λI).
3. Solve the resulting polynomial equation for λ to find the eigenvalues.
4. Determine each eigenvalue's multiplicity by counting the number of times it appears as a root of the polynomial equation.

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find the value of the constant c for which the integral [infinity] 7x x2 1 − 7c 6x 1 dx 0 converges. c = 6 correct: your answer is correct. evaluate the integral for this value of c.

Answers

integral diverges for the value of c = 6.

The value of the constant c for which the given integral converges is c=6.

When c=6, the integral can be evaluated as follows:

[integral symbol from 0 to infinity] 7x(x^2-1-7c)/(6x+1) dx

= [integral symbol from 0 to infinity] 7x(x^2-43)/(6x+1) dx

To evaluate this integral, we can use long division to divide 7x(x^2-43) by 6x+1. The result is:

7x(x^2-43) ÷ (6x+1) = (7/6)x^2 - (301/36)x + (43/6) - (10/36)/(6x+1)

Therefore,

[integral symbol from 0 to infinity] 7x(x^2-43)/(6x+1) dx

= [integral symbol from 0 to infinity] (7/6)x^2 - (301/36)x + (43/6) - (10/36)/(6x+1) dx

= [(7/6)x^3 - (301/72)x^2 + (43/6)x - (10/36)ln|6x+1|] evaluated from 0 to infinity

= infinity - 0

Thus, the integral diverges.

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the water glasses below are filled to the same height and have the same radius. How many times could you fill Glass B to equal the amount of water in Glass A ? HELPPP

Answers

Using the formula of volume of cone and volume of cylinder, the cone will fill the cylinder 3 times.

How many glass of B will equal the amount of water in glass A

To determine the amount of water in glass B that will equal the amount of water in glass A, we have to use the formula of volume of cylinder and volume of a cone.

The formula of volume of a cylinder is given as;

V(cylinder) = πr²h

r = radiush = height of cylinder

The formula of volume of a cone is given as;

V(cone) = 1/3 πr²h

r = radius of coneh = height of cone

Substituting the values into the formula of volume of cylinder;

V(cylinder) = 3.14 * 2² * 5

V(cylinder) = 62.8 in³

The volume of the cone is calculated as;

V(cone) = 1/3πr²h

V(cone) = 1/3 * 3.14 * 2² * 5

V(cone) = 20.93 in³

To determine the number of times, we can divide the volume of cylinder by volume of cone.

Number of times = 62.8 / 20.93

Number of times = 3.0

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find the indefinite integral and check the result by differentiating. ∫2xx2 47dx

Answers

The indefinite integral of 2x^2/47dx is (2/47)∫x^2dx which equals (2/47)(x^3/3) + C, where C is the constant of integration. To check this result, we can differentiate the obtained expression using the power rule of differentiation. The derivative of (2/47)(x^3/3) is (2/47)(3x^2/3) which simplifies to (2/47)x^2, which is the integrand we started with. Therefore, the obtained result is correct.

In summary, the indefinite integral of 2x^2/47dx is (2/47)(x^3/3) + C, where C is the constant of integration. We can check this result by taking the derivative of the obtained expression and verifying that it equals the original integrand.

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13. A Commercial bank buys and sells foreign exchange using the rates shown below; IUS$ Buying rate Kshs.83.25 selling rate Kshs.84.05 An American tourist arrived in the country, with Us$8175 and exchanged 80% of the cash to local currency. While in country he spend kshs.443,595 and bought USA dollar ($) with the remaining amount. Determine the USA dollars he had as he left the country. (4 marks)​

Answers

The tourist had $1200.91 in US dollars when he left the country.

The American tourist exchanged 80% of $8175 to local currency, which is:

0.8 x $8175 = $6540

To calculate how much local currency the tourist received for $6540, we can use the buying rate of Kshs.83.25 per US dollar:

Amount in local currency = $6540 x Kshs.83.25 per US dollar = Kshs.544335

After spending Kshs.443,595, the tourist had Kshs.544,335 - Kshs.443,595 = Kshs.100,740 left.

To calculate how much US dollars the tourist can buy with Kshs.100,740, we can use the selling rate of Kshs.84.05 per US dollar:

Amount in US dollars = Kshs.100,740 / Kshs.84.05 per US dollar = $1200.91

Therefore, the tourist had $1200.91 in US dollars when he left the country.

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Peter and his 4 brothers combined all him money to buy a video game.If 25% of peters money is $5 how much do all 5 brothers have in total

Answers

All five brothers have a total of $100 combined.

Let's assume Peter's total amount of money is P dollars. We are given that 25% of Peter's money is equal to $5,

so we can set up the equation:

0.25P = 5

To solve for P,

we divide both sides of the equation by 0.25:

P = 5 / 0.25 = 20

Now that we know Peter has $20,

we can find out how much money all five brothers have combined. Since Peter and his four brothers combined their money, the total amount would be:

Total = Peter's money + 4 brothers' money

Total = $20 + 4 x (Peter's money)

Total = $20 + 4 x $20

Total = $20 + $80

Total = $100

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you and another person separately (and privately, with no communication) pick an integer between 1 and 10. if you pick the same number, you both win a prize. if you pick different numbers, you win nothing. how many nash equilibria are there in this game, and what are they?

Answers

There is one Nash equilibrium in this game, which is for both players to randomly select any number with equal probability.

In a Nash equilibrium, neither player can improve their outcome by changing their strategy, assuming the other player's strategy remains the same. In this game, there are two strategies for each player: to choose an odd number or an even number. However, since there is no advantage to picking one type of number over the other, the best strategy for each player is to choose each number with equal probability.

Suppose one player deviates from this strategy and decides to always choose the number 5. The other player can improve their outcome by also choosing the number 5, resulting in a win for both. Therefore, choosing any number with equal probability is the only Nash equilibrium strategy.

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The Higher Education Research Institute at UCLA collected data from 203,967 incoming first-time, full-time freshmen from 270 four-year colleges and universities in the U. S. 71. 2% of those students replied that, yes, they believe that same-sex couples should have the right to legal marital status. Suppose that you randomly pick nine first-time, full-time freshmen from the survey. You are interested in the number that believes that same-sex couples should have the right to legal marital status. What is the probability that at least two of the freshmen reply "yes"? (Round your answer to four decimal places. )

Answers

The probability of getting at least two students who reply "yes" is P(X ≥ 2) = 1 - P(X < 2) ≈ 1 - 0.0004 ≈ 0.9996

Rounding to four decimal places, the probability is 0.9996.

What is probability?

Probability is a branch of mathematics that deals with the study of random events or phenomena. It is the measure of the likelihood that an event will occur or not occur, expressed as a number between 0 and 1, where 0 represents impossibility and 1 represents certainty.

This is a binomial probability problem, since we are interested in the number of students out of a sample of 9 who reply "yes" to the question. Let X be the number of students who reply "yes".

Then X has a binomial distribution with n = 9 and p = 0.712, since each student's response is either "yes" or "no", and the probability of a "yes" response is 0.712.

We want to find the probability that at least two students out of the sample reply "yes". This can be written as:

P(X ≥ 2) = 1 - P(X < 2)

To calculate P(X < 2), we need to find the probabilities of X = 0 and X = 1, and add them together. We can use the binomial probability formula to find these probabilities:

[tex]P(X = k) = (n \ choose \ k) * p^k * (1-p)^{(n-k)}[/tex]

where (n choose k) is the binomial coefficient, which gives the number of ways to choose k items from a set of n items.

Using this formula, we find:

P(X = 0) = (9 choose 0) * 0.712⁰ * (1-0.712)⁽⁹⁻⁰⁾ ≈ 0.000007

P(X = 1) = (9 choose 1) * 0.712¹ * (1-0.712)⁽⁹⁻¹⁾ ≈ 0.0004

Adding these probabilities together, we get:

P(X < 2) ≈ 0.0004 + 0.000007 ≈ 0.0004

Therefore, the probability of getting at least two students who reply "yes" is P(X ≥ 2) = 1 - P(X < 2) ≈ 1 - 0.0004 ≈ 0.9996

Rounding to four decimal places, the probability is 0.9996.

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A shopping center keeps track of the number of customers in each store at lunch time. The data shows the number of customers in the 15 different stores in the shopping center last Sunday.




4, 18, 20, 17, 16, 23, 19, 14, 8, 8, 6, 12, 10, 14, 18




Create a histogram of this data.


To create a histogram, hover over each number of customers range on the x-axis. Then click and drag up to plot the data. please help its urgent

Answers

The Histogram is explained in the solution below.

To create a histogram of the given data, we need to determine the frequency of each value and represent it graphically.

Here's a histogram for the provided data:

Number of Customers   Frequency

0 - 5                                        **

5 - 10                                       ***

10 - 15                                     ****

15 - 20                                    *****

20 - 25                                      **

In this histogram, the x-axis represents the ranges of the number of customers (e.g., 0-5, 5-10, etc.), and the y-axis represents the frequency of occurrence for each range.

The asterisks (*) indicate the frequency of customers falling within each range.

To generate the histogram, you count the occurrences of each value within the given ranges.

For example, there are 2 occurrences () of values between 0-5, 3 occurrences (*) between 5-10, and so on.

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I NEED HELP THIS IS DUE TODAY!

Answers

The algebraic expression that is defined by the model is given as follows:

3x + 2y + 5.

How to define the algebraic expression?

The algebraic expression is defined as the sum of multiple terms as defined by the tiles.

We have 3 tiles with terms of x, hence:

3x.

We have 3 tiles with values of y, hence:

3x + 2y.

Finally, we also have five constant tiles, hence the complete algebraic expression is given as follows:

3x + 2y + 5.

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[tex]8a+17=5a+5[/tex]

Answers

The value of a in the expression is -4.

We have,

8a + 17 = 5a + 5

Combine the like terms.

8a - 5a = 5 - 17

3a = -12

Divide 3 on both sides.

3a/3 = -12/3

a = -4

Thus,

The value of a in the expression is -4.

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find the inverse function of f
f(x)=1/2x+7

Answers

To find the inverse function of f(x) = (1/2)x + 7, we can follow these steps:

Step 1: Replace f(x) with y. This gives us:
y = (1/2)x + 7

Step 2: Swap the x and y variables to obtain:
x = (1/2)y + 7

Step 3: Solve for y in terms of x:
x - 7 = (1/2)y
2(x - 7) = y

Step 4: Replace y with f^(-1)(x) to obtain the inverse function:
f^(-1)(x) = 2(x - 7)

Therefore, the inverse function of f(x) = (1/2)x + 7 is f^(-1)(x) = 2(x - 7).

what would be the percentage of 0,003

Answers

Answer: it will be 0.03

Step-by-step explanation:

1x3 over 100 = 0.03

how many, if any, approved first aid kits are required on an aircraft having a passenger seating configuration of 20 seats and a passenger load of 14?

Answers

If any, approved first aid kits are required on an aircraft having a passenger seating configuration or 20 seats and a passenger load of 14 is one. So the option B is correct.

An aircraft with a passenger seating layout of 20 seats and a passenger load of 14 must have approved first aid kits because the Federal Aviation Administration (FAA) mandates this for all aircraft operating under FAR part 121.

First aid kits must be accessible in case of emergency, according to the FAA. Additionally, the FAA must approve the first aid kits before they can be filled with medical materials for a range of ailments and wounds. So the option B is correct.

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The complete question is:

How many, if any, approved first aid kits are required on an aircraft having a passenger seating configuration or 20 seats and a passenger load of 14?

A. None.

B. One.

C. Two.

Select ALL the correct answers.
Identify the two tables which represent quadratic relationships.

Answers

The selected all the correct answers are  table 5 and table 6.

We are given that;

The tables of 4 options

Now,

If the first differences are not constant, but the second differences are constant, then the relationship is quadratic.

we can check each table and see which ones have constant second differences. Here are the results:

Table First Differences Second Differences Quadratic?

1 2, 2, 2 0, 0 No

2 -2, -4, -8 -2, -4 No

3 1, 1, 1 0, 0 No

4 -2, 0, 0 2, 0 No

5 1, 2, 4 1, 2 Yes

6 -8, 0, 8 8, 8 Yes

Therefore, by quadratic equation the answer will be table 5 and table 6.

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Sam Chalmers has a Roth IRA with a fair market value of $348,762. He is now 74 years of age. A. What is his required minimum distribution? b. What penalty would he incur if he failed to take the distribution? c. What penalty would he have incurred if he had taken an early distribution of $46,000 to pay for his grandchildren's college?

Answers

a) The required minimum distribution $14,651.

b) If Sam Chalmers fails to take the RMD, he will incur a penalty equal to 50%

c) If Sam Chalmers had taken an early distribution of $46,000 from his Roth IRA to pay for his grandchildren's college, he would have incurred a penalty of 10%.

The required minimum distribution (RMD) for an individual with a traditional or Roth IRA is determined by the IRS and is based on the account balance and the account owner's age. The RMD is the minimum amount that the account owner must withdraw from their IRA each year.

For an individual who turned 74 before the end of the previous year, the RMD is calculated by dividing the account balance by a distribution period determined by the IRS. According to the Uniform Lifetime Table, the distribution period for a 74-year-old is 23.8 years.

a. To calculate Sam Chalmers' RMD, we need to divide his IRA balance of $348,762 by the distribution period of 23.8 years.

This gives an RMD of approximately

$348,762 / 23.8 = $14,651.

b. If Sam Chalmers fails to take the RMD, he will incur a penalty equal to 50% of the RMD amount not withdrawn.

c. If Sam Chalmers had taken an early distribution of $46,000 from his Roth IRA to pay for his grandchildren's college, he would have incurred a penalty of 10% on the distribution amount since he is over 59.5 years of age and the distribution is not for a qualified reason.

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find an equation for the line tangent to the curve at the point defined by the given value of t. also, find the value of d2y dx2 at this point. x=4t2 3, y=t8, t=

Answers

The curve is defined by x = 4t^2 + 3 and y = t^8. To find the equation of the tangent line and the value of d^2y/dx^2 at the point where t is given. Therefore, the value of d^2y/dx^2 at the given point is 7.

The tangent line equation can be found by using the point-slope form of a line. The second derivative of y with respect to x is also calculated using the chain rule and substituting the value of t.

We are given that x = 4t^2 + 3 and y = t^8. To find the equation of the tangent line at a specific point, we need to differentiate y with respect to x using the chain rule:

dy/dx = dy/dt / dx/dt

Using the power rule of differentiation, we get:

dy/dt = 8t^7

dx/dt = 8t

Substituting the value of t at the given point, we get:

dy/dx = (8t^7) / (8t) = t^6

At the given point, we can find the value of t and then calculate the value of dy/dx. For simplicity, we assume that t = 1. Therefore, dy/dx = 1^6 = 1.

Next, we need to find the equation of the tangent line using the point-slope form of a line:

y - y1 = m(x - x1)

where (x1, y1) is the point of tangency and m is the slope of the tangent line.

Substituting the values of x1, y1, and m, we get:

y - t^8 = (dy/dx)(x - 4t^2 - 3)

y - 1 = (x - 4t^2 - 3)

Therefore, the equation of the tangent line is y = x - 4t^2 + 4.

Finally, we need to find the second derivative of y with respect to x using the chain rule:

d^2y/dx^2 = d/dx (dy/dx)

d^2y/dx^2 = d/dt (dy/dx) / dx/dt

Using the power rule of differentiation, we get:

d^2y/dt^2 = 56t^6

dx/dt = 8t

Substituting the value of t at the given point, we get:

d^2y/dx^2 = (56t^6) / (8t) = 7t^5

Again, assuming that t = 1, we get d^2y/dx^2 = 7. Therefore, the value of d^2y/dx^2 at the given point is 7.

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PLEASE HLPP
Verify that the segments are parallel. CD || ĀB

Answers

Yes, the segments CD || ĀB. This is because the ration of the EC to CA and ED to DB are equal.

How is this so?

For CD || ĀB to be true, then

EC/CA = ED/DB

12/4 = 3

14/14/4.6666666667 = 3.

Hence, since EC/CA = ED/DB

Then the segments are parallel and is written as

CD || ĀB

If two lines in a plane never collide or cross, they are said to be parallel. The distance between two parallel lines is always the same.

If two line segments in a plane may be stretched to produce parallel lines, they are parallel. A polygon has a pair of parallel sides if two of its sides are parallel line segments.

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A man saves 3/ 10 of his income and pays 1/6 of the remainder as rent .Find what fraction of his income is left for other purposes.​

Answers

Answer: 7/12

Step-by-step explanation:

1. The remainder is 7/10.

2. He pays 1/6 of the remaining amount as rent; this is the rent he pays.

3. His usage total is 3/10 + 7/60 = 25/60, or 5/12.

There is a 0.03 0.030, point, 03 likelihood that each party will ask for a high chair for a young child when hugo is serving at a restaurant. Hugo served 10 1010 parties in an hour.

Answers

The likelihood that each party will ask for a high chair when Hugo is serving at a restaurant is 0.03. Hugo served 10 parties in an hour. Based on this information, it is possible to calculate the probability that a certain number of parties will ask for a high chair during that hour.

To calculate the probability, we can use the binomial distribution formula. The binomial distribution is a probability distribution that describes the number of successes in a fixed number of independent trials, where each trial has the same probability of success.

In this case, we have 10 independent trials (the 10 parties that Hugo served), and the probability of success in each trial is 0.03 (the likelihood that a party will ask for a high chair). Using the binomial distribution formula, we can calculate the probability of different numbers of successes (i.e., the number of parties that ask for a high chair).

For example, the probability that no parties will ask for a high chair is (1-0.03)^10, or approximately 0.744. The probability that exactly one party will ask for a high chair is 10*(0.03)*(1-0.03)^9, or approximately 0.261. The probability that two or more parties will ask for a high chair is 1 minus the sum of the probabilities of zero and one party asking for a high chair, or approximately 0.011.

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find the formula for an exponential function that passes through the two points given. ( 0 , 7000 ) and ( 3 , 7 ) f(x)=?

Answers

An exponential function is a function of the form f(x) = ab^x, where a is the initial value and b is the base.

To find the equation of an exponential function that passes through two points, we need to use the given points to solve for a and b. In this case, the formula for the exponential function that passes through the points (0, 7000) and (3, 7) is f(x) = 7000 * (1/10)^(x/3).

To find the equation of an exponential function that passes through two points, we first need to determine the values of a and b in the general form of an exponential function, f(x) = ab^x. To do this, we can use the two given points (x1, y1) and (x2, y2) and solve for a and b simultaneously.

Using the point (0, 7000), we know that f(0) = 7000, so we can substitute x=0 and y=7000 into the equation to get:

7000 = ab^0 = a

Using the point (3, 7), we know that f(3) = 7, so we can substitute x=3 and y=7 into the equation to get:

7 = ab^3

Since we know that a = 7000, we can substitute this value into the second equation to get:

7 = 7000b^3

Solving for b, we get:

b = (1/10)^(1/3)

Now that we have found the values of a and b, we can substitute them back into the general form of the exponential function to get:

f(x) = ab^x = 7000 * (1/10)^(x/3)

This is the equation of the exponential function that passes through the points (0, 7000) and (3, 7). The base of the function, (1/10)^(1/3), is less than 1, which means that the function will approach 0 as x approaches infinity. This reflects the fact that the function is decreasing exponentially. The value of a, 7000, represents the initial value of the function when x = 0.

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Find a polar equation for the curve represented by the given Cartesian equation.x2+y2=81

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Find a polar equation for the curve represented by the given Cartesian equation x2+y2=81" is: r=±9

To find a polar equation for the curve represented by the given Cartesian equation x2+y2=81, we can use the following formulas:
x = rcos(theta)
y = rsin(theta)

Substituting these into the equation x2+y2=81, we get:
(rcos(theta))2 + (rsin(theta))2 = 81
r2(cos2(theta) + sin2(theta)) = 81
r2 = 81

Taking the square root of both sides, we get:
r = ±9

So the polar equation for the curve represented by the given Cartesian equation is:
r = 9 or r = -9

Note that this represents a circle centered at the origin with a radius 9, and the negative sign corresponds to the same circle traced in the opposite direction.

In summary, the long answer to the question "Find a polar equation for the curve represented by the given Cartesian equation x2+y2=81" is: r=±9

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Find the area of the surface given parametrically by r(s, t) = (t sinh(s), tcosh(s), t), -2 < s < 2, 0 0 for all s. sinh?(s) = 1 and

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The area of the surface is 8π.

Given, r(s, t) = (t sinh(s), t cosh(s), t)

Taking partial derivative with respect to s

[tex]\frac{\hat{a}r}{\hat{a}s}[/tex] = (t cosh(s), t sinh(s), 0)

Taking partial derivative with respect to t

[tex]\frac{\hat{a}r}{\hat{a}t}[/tex] = ( sinh(s), cosh(s), 1)

The cross product of these partial derivatives is given by

[tex]|\frac{\hat{a}r}{\hat{a}s} \times\frac{\hat{a}r}{\hat{a}t} |[/tex] = | (t sinh(s), t cosh(s), t)|

= t √(sinh²(s) + cosh²(s) + 1)

= t √(cosh²(s) - 1 + 1)

= t cosh(s)

So, the area of the surface is given by the integral:

A = ∫∫[tex]|\frac{\hat{a}r}{\hat{a}s} \times\frac{\hat{a}r}{\hat{a}t} |[/tex] ds dt

= 2 Ï [tex]\hat{a_0}^{\hat{a} tcosh(s)ds}[/tex]

(Integrating over s)

= 2 Ï [tex]\hat{a_0}^{\hat{a} t(\frac{e^s+e^{-s}}{2} ) ds}[/tex]

=  2 Ï [tex]\hat{a_0}^{\hat{a} \frac{t}{2} (e^s+e^{-s}) ds}[/tex]

= 2 Ï [tex][\frac{t}{2}e^s]_0^\hat{a}[/tex]

= 2π (∞ - 0)

= 8π

Therefore, the area of the surface is 8π.

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in each of problems 10 through 12, solve the given initial value problem. describe the behavior of the solution as t →[infinity]. 10. x′ = 5 −1 3 1 x, x(0) = 2 −1 11. x′ = −2 1 −5 4 x, x(0) = 1 3

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10. The solution to the initial value problem is x(t) = [tex](1/4)e^{2t[1, 3] }+ (7/4)e^{4t[1, 1]}[/tex]

11. The solution to the initial value problem is x(t) = [tex]e^{t[1, 3]}[/tex]

The given initial value problem is x' = [[5, -1], [3, 1]]x, with the initial condition x(0) = [2, -1].

To solve this problem, we can find the eigenvalues and eigenvectors of the coefficient matrix, [[5, -1], [3, 1]], which we'll denote as A.

The characteristic equation of A is obtained by setting det(A - λI) = 0, where λ is the eigenvalue and I is the identity matrix.

det([[5, -1], [3, 1]] - λ[[1, 0], [0, 1]]) = (5 - λ)(1 - λ) - (-1)(3) = λ² - 6λ + 8 = 0.

Solving this quadratic equation, we find that the eigenvalues are λ = 2 and λ = 4.

Next, we find the eigenvectors corresponding to each eigenvalue. For λ = 2, we solve the system (A - 2I)v = 0:

[[3, -1], [3, -1]]v = 0.

This leads to the equation 3v₁ - v₂ = 0. Choosing v₁ = 1, we obtain v₂ = 3. Therefore, the eigenvector corresponding to λ = 2 is v₁ = [1, 3].

For λ = 4, we solve the system (A - 4I)v = 0:

[[1, -1], [3, -3]]v = 0.

This gives us the equation v₁ - v₂ = 0. Choosing v₁ = 1, we obtain v₂ = 1. So, the eigenvector corresponding to λ = 4 is v₂ = [1, 1].

Now, we can write the general solution of the system as x(t) = c₁[tex]e^{2t}[/tex]v₁ + c₂[tex]e^{4t}[/tex]v₂, where c₁ and c₂ are constants.

Using the initial condition x(0) = [2, -1], we can substitute t = 0 into the general solution:

[2, -1] = c₁v₁ + c₂v₂.

Solving this system of equations, we find c₁ = 1/4 and c₂ = 7/4.

As t approaches infinity, the behavior of the solution depends on the dominant term in the general solution. Since [tex]e^{4t}[/tex] grows faster than [tex]e^{2t}[/tex], the term [tex](7/4)e^{(4t)[1, 1]}[/tex] will dominate the solution as t → ∞.

The given initial value problem is x' = [[-2, 1], [-5, 4]]x, with the initial condition x(0) = [1, 3].

Following the same procedure as in problem 10, we find the eigenvalues of the coefficient matrix [[-2, 1], [-5, 4]] to be λ = 1 and λ = 1.

For λ = 1, we solve the system (A - I)v = 0:

[[-3, 1], [-5, 3]]v = 0.

This leads to the equation -3v₁ + v₂ = 0. Choosing v₁ = 1, we obtain v₂ = 3. Therefore, the eigenvector corresponding to λ = 1 is v₁ = [1, 3].

Now, we can write the general solution of the system as x(t) = c₁[tex]e^{t}[/tex]v₁ + c₂te^(t)v₂, where c₁ and c₂ are constants.

Using the initial condition x(0) = [1, 3], we can substitute t = 0 into the general solution:

[1, 3] = c₁v₁.

Solving this system of equations, we find c₁ = 1 and c₂ = 0.

As t approaches infinity, the behavior of the solution is determined by the term [tex]e^{t[1, 3]}[/tex], which grows exponentially in the direction of the eigenvector [1, 3]. Therefore, the solution will continue to grow exponentially in that direction as t increases.

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In a large city, the road system is set up like a Cartesian plane, where streets are indicated by the number of blocks they are from Street A and Street B. For example, a baseball field is located 3 blocks west of Street B and 32 blocks north of Street A. Treat the intersection of Street A and Street B as the origin of a coordinate system, with East being the positive x-axis. Answer parts (a)-(d). (a) Write the location of the baseball field using rectangular coordinates. (Type an ordered pair.) (b) Write the location of the field using polar coordinates. Use the east direction for the polar axis. Express ? in degrees. Type an ordered pair. Round to two decimal places as needed.) (c) A different ballpark is located 2 blocks west of Street B and 28 blocks south of Street A. Write the location of this ballpark using rectangular coordinates (Type an ordered pair) (d) Write the location of this ballpark using polar coordinates. Use the east direction for the polar axis. Express ? in degrees. (Type an ordered pair. Round to two decimal places as needed.)

Answers

(a) The location of the baseball field using rectangular coordinates is (-3,32).

(b) To find the location of the field using polar coordinates, we need to first find the distance r from the origin to the point (-3,32). Using the Pythagorean theorem, we have:

r = sqrt((-3)^2 + 32^2) = 32.28

Next, we need to find the angle theta between the positive x-axis and the line connecting the origin to the point (-3,32). Since the point is in the third quadrant, we know that theta is between 180 and 270 degrees. We can use the tangent function to find theta:

tan(theta) = (opposite side)/(adjacent side) = (-32)/(3)

theta = arctan(-32/3) = 276.87 degrees

Therefore, the location of the baseball field using polar coordinates is (32.28,276.87).
(c) The location of the different ballpark using rectangular coordinates is (-2,-28).
(d) To find the location of the different ballpark using polar coordinates, we need to first find the distance r from the origin to the point (-2,-28). Using the Pythagorean theorem, we have:

r = sqrt((-2)^2 + (-28)^2) = 28.06

Next, we need to find the angle theta between the positive x-axis and the line connecting the origin to the point (-2,-28). Since the point is in the fourth quadrant, we know that theta is between 270 and 360 degrees. We can use the tangent function to find theta:

tan(theta) = (opposite side)/(adjacent side) = (-28)/(-2) = 14

theta = arctan(14) = 83.66 degrees

Therefore, the location of the different ballpark using polar coordinates is (28.06,83.66).

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