What is the meaning of "the homotopy classes of paths from x to x in a space X"?

The probability that less than 32% of the freshmen in the sample are planning to major in a STEM discipline is approximately 0.9049.

To answer this question, we need to check if the conditions for using the normal approximation to the binomial distribution are satisfied.

The conditions are:

The sample is a simple random sample.

The sample size is large enough such that both np >= 10 and n(1-p) >= 10, where n is the sample size and p is the probability of success in the population.

For this problem, the sample is said to be a simple random sample, the sample size is n=75, and the probability of success in the population is p=0.26.

We check the conditions:

np = 75 × 0.26 = 19.5

n(1-p) = 75 × (1-0.26) = 55.5

Both np and n(1-p) are greater than or equal to 10, so the conditions for using the normal approximation are satisfied.

To find the probability that less than 32% of the freshmen in the sample are planning to major in a STEM discipline, we can use the normal approximation to the binomial distribution:

mean = np = 75 × 0.26 = 19.5

standard deviation = √(np(1-p)) = √(75 × 0.26 × 0.74) = 3.43

To find the probability that less than 32% of the freshmen in the sample are planning to major in a STEM discipline, we need to standardize the value of 32% using the formula:

z = (x - mean) / standard deviation

where x is the value we are interested in, the mean is the mean of the binomial distribution, and the standard deviation is the standard deviation of the binomial distribution.

In this case, x = 0.32 × 75 = 24, mean = 19.5, and standard deviation = 3.43. Therefore,

z = (24 - 19.5) / 3.43 = 1.31

Using a standard normal distribution table or a calculator, we can find that the probability of a standard normal variable is less than 1.31 is 0.9049.

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The question is -

Future scientists: Education professionals refer to science, technology, engineering, and mathematics as the STEM disciplines. A research group reported that 26% of freshmen entering college in a recent year planned to major in a STEM discipline. A random sample of 75 freshmen is selected. Round the answer to at least four decimal places. Is it appropriate to use the normal approximation to find the probability that less than 32% of the freshmen in the sample are planning to major in a STEM discipline?

Matrix B and AB both are invertible implies that A is invertible as a matrix C such that AC = CA = I.

For matrix A to be invertible,

Show that there exists a matrix C such that AC = CA = I,

where I is the identity matrix.

Since B and AB are both invertible,

There exist matrices D and E such that ,

BD = DB = I

And ABE = EAB = I.

Multiplying both sides of the equation ABE = I by D on the left and E on the right, we get,

ADEBE = DE

Since BD = I, we can simplify this to,

ADE = DE

Multiplying both sides of this equation by B on the left and B^(-1) on the right, we get,

AD = DB^(-1)

Now, let C = DB^(-1).

Then we have,

AC

= ADB^(-1)

= ABEB^(-1)

= AI

= A

and

CA

= DB^(-1)A

= DB^(-1)ABE

= DI

= I

Therefore, A is invertible as a matrix C such that AC = CA = I.

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Answer:

find how many inches are in one square yard. if it's more than 296, then it doesn't cover it. If it's less, then it does.

Step-by-step explanation:

Answer:

it's 3.9

Step-by-step explanation:

Assume Samir has total 100 songs and use combined mean formula

Answer: False, False, True, True, True.

Step-by-step explanation:

Remember, if there are two intersecting lines on a graph, and they come to one point on a graph, it only has one solution. If two lines are parallel, and don't intersect with each other, they have no solution. If there are two equations, and both are on the same line, then they have infinitely many solutions.

y - 3x = -2, and y = 3x - 2, are equal, since they are one line.

So, the first and second questions are false, since there's only 1 solution, making the third question true. The point (-1, -5), is a true answer, since the x would be -1, and the y would be -5. (Example below.)

y = 3x - 2

y = 3(-1) - 2

y = -3 - 2

y = -5

The two lines in the equations do have the same slope, since the slope for each is 3x. Or think about slope-intercept form, (y = mx + b)

y - 3x = -2, and y = 3x - 2

y - 3x = -2

y = 3x - 2 is equal to y = 3x - 2, which makes this answer true.

Hope this helps, (and can you give brainliest, please?)

The probability mass function (PMF) for z, the number of ones at the channel output, can be expressed using the binomial distribution where p is the probability of transmitting a one and n is the total number of bits transmitted.

A probability mass function (PMF) is a function that assigns probabilities to each possible outcome in a discrete probability distribution. It describes the probability distribution of a discrete random variable, which takes on a finite or countably infinite number of possible values. The PMF is defined as the probability of each possible outcome, with the sum of all probabilities equal to 1. It is typically denoted as P(X = x), where X is the random variable and x is a possible value that it can take. The PMF is used to calculate various properties of the probability distribution, such as the expected value, variance, and higher moments.

The probability mass function (PMF) for z, the number of ones at the channel output, can be expressed using the binomial distribution formula:

[tex]$p(z) = \binom{n}{z} p^z (1-p)^{n-z}$[/tex]

where p is the probability of transmitting a one, n is the total number of bits transmitted, and [tex]$\binom{n}{z}$[/tex] is the binomial coefficient which counts the number of ways to choose z ones from n bits. The PMF specifies the probability of observing each possible value of z, ranging from 0 to n.

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Answer:

Step-by-step explanation:

The length of the top of the bookcase should be approximately 25 inches to display the soap carving collection with an area of 300 in².

To find the length of the top of the bookcase (which we'll call "b"), we need to know the area of the collection of soap carvings and the formula for the area of a rectangle:

Area = length x width

We're given the area of the soap carving collection (300 square inches), and we know that the soap carvings will be displayed on top of the bookcase, which is a rectangle.

Let's assume that the width of the bookcase is 1 unit (we can choose any unit we want, as long as we're consistent). Then we can write:

300 = b x 1

Simplifying this equation, we get:

b = 300/1

b = 300

So the length of the top of the bookcase should be 300 inches. However, this assumes that the width of the bookcase is only 1 inch, which is quite narrow.

If we assume a more reasonable width of, say, 12 inches, then we can write:

300 = b x 12

Simplifying this equation, we get:

b = 300/12

b = 25

So the length of the top of the bookcase should be 25 inches (if the width of the bookcase is 12 inches).

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10 is the value of k of  the slope of the line .

What are slopes called?

Slope, usually referred to as rise over run, is a line's perceived steepness. By dividing the difference between the y-values at two places by the difference between the x-values, we can determine slope.

                                   You may determine a line's slope by looking at how steep it is or how much y grows as x grows. slope categories. When lines are inclined from left to right, they are said to have a positive slope, a negative slope, or a zero slope (when lines are horizontal).

the points  (2,4) and (5,k)

formula from slope of two points

        slope = y₂ - y₁/x₂ - x₁

substitute the values in formula

 slope = 2

 slope =  k - 4/5- 2

   2 =k - 4/3

   6 = k - 4

    k = 6 + 4  

      k = 10

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Answer: Permutations that preserve distances are also known as isometries or distance-preserving transformations.

Step-by-step explanation:

Permutations that preserve distances refer to a type of mathematical transformation that preserves the distances between pairs of points in a geometric space. In other words, if you have a set of points arranged in a particular way and you apply a permutation that preserves distances, the resulting arrangement of points will have the same distances between each pair of points as the original arrangement. This type of permutation is important in geometry and can be used to study properties of geometric objects such as polyhedra, graphs, and other structures. Permutations that preserve distances are also known as isometries or distance-preserving transformations.

(a) Therefore after t = 1.75 seconds the diver will hit the water.

(b) The velocity the diver hit the water is 56 ft/s.

From the given condition we have d(t) = 16t²

and the height is 49ft

(a) Now when the diver hit the water the equation become

16t² = 49

t² = 49/16

t = ±7/4

t = ±1.75

since time can not be negative so t = 1.75

Therefore after t = 1.75 seconds the diver will hit the water.

(b)

Now differentiating d(t) with respect to t we get

d'(t) = 32t

now putting t=7/4 we get

the velocity d'(7/4) = 32*7/4

d'(7/4) = 56ft/s

Therefore the velocity the diver hit the water is 56 ft/s.

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The complete question is :

A cliff diver plunges from a height of 49ft above the water surface. The distance the diver falls in t seconds is given by the function d(t)=16t²ft

(a) After how many seconds will the diver hit the water?

(b) With what velocity (in ft/s ) does the diver hit the water?

This is a non-linear function's graph. The function value y = 4 is the graph's y-intercept. With x = 1, the value of y with the highest value is y = 5. The function's value for x between x = 2 and x = 6 is 0.

The graph of a nonlinear function is not a line or a piece of a line. For instance: A balloon gains volume as you inflate it. The table below shows how a round balloon's volume grows as its radius changes.

This is a non-linear function's graph.

The y-intercept of the graph is the function value y = 4.

The x-intercepts of the graph (in order from least to greatest) are located at x = -3 and x = 5.

The greatest value of y is y = 5 and it occurs when x = 1. For x between x = 2 and x = 6, the function value y is 0.

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For x between x = 2 and x = 6, the function value y is positive.

What is a polynomial?

A polynomial is a mathematical expression consisting of variables (also known as indeterminates) and coefficients, which are combined using only the operations of addition, subtraction, multiplication, and non-negative integer exponents.

For example, the expression 3x^2 - 2x + 1 is a polynomial, where x is variable, and 3, -2, and 1 are the coefficients. The degree of the polynomial is the highest power of the variable in the expression, which in this case is 2.

Polynomials are used in various fields of mathematics and science, including algebra, calculus, physics, and engineering. They are used to model and analyze real-world phenomena, solve mathematical problems, and make predictions.

This is the graph of a polynomial function.

The y-intercept of the graph is the function value y = -3.

The x-intercepts of the graph (in order from least to greatest) are located at x = -2, x = 0, and x = 4.

The greatest value of y is y = 6, and it occurs when x = 3.

Therefore, For x between x = 2 and x = 6, the function value y is positive.

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The ice cream scoop will fit inside the cone without overflowing, as shown by the volume comparison, which reveals that V ice cream > V cone.

A cone is a smooth-tapering, three-dimensional geometric shape with a flat base and a pointed tip or vertex. A cone is made up of a collection of line segments, half-lines, or lines that link the apex—the common point—to every point on a base that is in a plane other than the apex. The base can be any shape, but is most often a circle. Cones are frequently used in science and mathematics, as well as in commonplace items like ice cream cones, party hats, and traffic cones.

given

We need to compare their volumes to see if the ice cream scoop will fit inside the cone or spill out.

The quantity of the ice cream scoop could be determined by applying the following formula for the volume of a sphere:

[tex]V ice cream = (4/3)\pi r^3 \\= (4/3)\pi (3 cm)^3 \\= 113.1 cm^3[/tex]

[tex]V cone = (1/3)\pi r^2h \\= (1/3)\pi (3 cm)^2(13 cm) \\= 122.7 cm^3[/tex]

The ice cream scoop will fit inside the cone without overflowing, as shown by the volume comparison, which reveals that V ice cream > V cone.

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The Euler's method was used to approximate the solution of two initial value problems at various time intervals with different step sizes. For problem, the solution is decreasing and converges to 1.

We will use the following formula for Euler's method:

y_{n+1} = y_n + h*f(t_n, y_n)

y' = 5 – 3sqrt(y), y(0) = 2

Using h = 0.1, we get:

t=0, y=2

t=0.1, y=1.738

t=0.2, y=1.508

t=0.3, y=1.303

t=0.4, y=1.119

t=0.5, y=0.953

Using h = 0.05, we get:

t=0, y=2

t=0.05, y=1.837

t=0.1, y=1.695

t=0.15, y=1.568

t=0.2, y=1.452

t=0.25, y=1.346

t=0.3, y=1.248

t=0.35, y=1.158

t=0.4, y=1.076

t=0.45, y=0.999

t=0.5, y=0.929

Using h = 0.025, we get:

t=0, y=2

t=0.025, y=1.861

t=0.05, y=1.737

t=0.075, y=1.622

t=0.1, y=1.516

t=0.125, y=1.418

t=0.15, y=1.328

t=0.175, y=1.246

t=0.2, y=1.17

t=0.225, y=1.101

t=0.25, y=1.038

t=0.275, y=0.98

t=0.3, y=0.927

t=0.325, y=0.878

t=0.35, y=0.833

t=0.375, y=0.791

t=0.4, y=0.753

t=0.425, y=0.718

t=0.45, y=0.685

t=0.475, y=0.655

t=0.5, y=0.627

Using h = 0.01, we get:

t=0, y=2

t=0.01, y=1.88

t=0.02, y=1.764

t=0.03, y=1.652

t=0.04, y=1.544

t=0.05, y=1.44

t=0.06, y=1.34

t=0.07, y=1.244

t=0.08, y=1.151

t=0.09, y=1.062

t=0.1, y=0.976

t=0.11, y=0.893

t=0.12, y=0.813

t=0.13, y=0.736

t=0.14, y=0.662

t=0.15, y=0.591

t=0.16, y=0.523

t=0.17, y=0.458

t=0.18, y=0

So, we can say that the step size had to be decreased to achieve more accurate approximations

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_____The given question is incomplete, the complete question is given below:

In each of Problems 9 and 10, use Euler's method to find approximate values of the solution of the given initial value problem at t = 0.5, 1, 1.5, 2, 2.5, and 3: a. With h=0.1. b. With h = 0.05. c. With h= 0.025. d. With h=0.01.

9. y' = 5 – 3 sqrt y,      y(0) = 2

On solving the question we can say that so the other side of triangle is [tex]B = \sqrt324[/tex], therefore the angle will be [tex]cos^{-1} (0.38)[/tex].

A triangle is a closed two-dimensional geometric object consisting of three line segments, called edges, that intersect at three places called vertices. Triangles are distinguished by their sides and angles. A triangle can be equilateral (all sides equal), isosceles, or odd, depending on the sides. Triangles are classified as acute (any angle less than 90 degrees), right (angles equal to 90 degrees), or obtuse (any angle greater than 90 degrees). The area of ​​a triangle can be calculated using the formula A =​​ (1/2)bh. where A is the area, b is the base of the triangle, and h is the height of the triangle.  

here two sides of the triangle are given that are 19.5 and 7.5

so by

[tex]A^2 = B^2 + C^2\\B^2 = 19.5^2 - 7.5^2\\B^2 = 380.25 - 56.25\\B^2 = 324\\B = \sqrt324[/tex]

so the other side is [tex]B = \sqrt324[/tex], therefore the angle will be [tex]cos^{-1} (0.38)[/tex].

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[tex]53 - 3^2 * 3 = 35[/tex]

The correct option on Hash 1 and Hash 2 is C. Hash 1 is designed to work with small input data, while Hash 2 is optimized for processing large input data.

The main difference between Hash 1 and Hash 2 is the amount of input data they can process. Hash 1 can process input data that is 2 characters long, while Hash 2 can handle input data that is up to 300,000 characters long. This means that Hash 2 is better suited for processing larger datasets than Hash 1.

In terms of which hash function is better suited for different types of data, it depends on the specific application and the characteristics of the data being processed. For example, if the data being hashed is small and of low complexity, Hash 1 may be a good choice due to its speed and simplicity.

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The options for this question include:

Answer:

To find the annual rainfall in 2018, we need to add 12% of the rainfall in 2017 to the rainfall in 2017.

12% of 420mm can be calculated as:

12/100 * 420 = 50.4mm

Therefore, the annual rainfall in 2018 can be calculated as:

420 + 50.4 = 470.4mm

So the annual rainfall in 2018 in Opuwo was 470.4mm.

Step-by-step explanation:

the annual rainfall in Opuwo in 2018 was 470.4mm.

Why it is and what is Rainfall in mathematics?

To find the annual rainfall in 2018, we need to add 12% of the rainfall in 2017 to the rainfall in 2017.

12% of 420mm can be found by multiplying 420 by 0.12:

12% of 420 = 0.12 × 420 = 50.4

Therefore, the annual rainfall in 2018 is:

Annual rainfall in 2018 = Annual rainfall in 2017 + 12% of Annual rainfall in 2017

Annual rainfall in 2018 = 420 + 50.4

Annual rainfall in 2018 = 470.4mm

So the annual rainfall in Opuwo in 2018 was 470.4mm.

In mathematics, rainfall usually refers to the amount of precipitation (rain, snow, sleet, hail, etc.) that falls within a specific area over a given period of time, typically measured in millimeters or inches. Rainfall can be measured using various methods, such as rain gauges or radar, and is an important factor in hydrology, meteorology, and agriculture.

Rainfall data can be analyzed and modeled using mathematical techniques, such as statistical analysis and differential equations.

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The average rate of change is 5π; for r changing from 2 to 2.5, it is 2.5π, and for r changing from 2 to 2.1, it is 4.1π.

The area of a circle is given by the formula A = πr². To find the average rate of change of A with respect to r, we can take the derivative of A with respect to r:

dA/dr = 2πr

This tells us how much the area changes for a small change in the radius. To find the average rate of change over a larger interval, we can use the formula:

ΔA/Δr = (A2 - A1)/(r2 - r1)

where A1 and A2 are the areas at the initial and final radii, and r1 and r2 are the initial and final radii.

(i) For r changing from 2 to 3:

ΔA/Δr = (π(3)² - π(2)²)/(3 - 2) = 5π

The average rate of change of the area with respect to the radius is 5π.

(ii) For r changing from 2 to 2.5:

ΔA/Δr = (π(2.5)² - π(2)²/(2.5 - 2) = 2.5π

The average rate of change of the area with respect to the radius is 2.5π.

(iii) For r changing from 2 to 2.1:

ΔA/Δr = (π(2.1)² - π(2)²)/(2.1 - 2) = 4.1π

The average rate of change of the area with respect to the radius is 4.1π.

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The probability that the average of 49 marathons is between 143 and 147 minutes is 0.5980. The 60th percentile is 148.25 minutes, and the median is 146 minutes.

The average of a sample of 49 marathons will be approximately normally distributed with mean = 146 minutes and standard deviation = 15/sqrt(49) = 15/7.

To find the probability that the average of the sample will be between 143 and 147 minutes, we can standardize the values:

z1 = (143 - 146) / (15/7) = -1.4

z2 = (147 - 146) / (15/7) = 0.4667

Then, using a standard normal distribution table or calculator, we find:

P(-1.4 < Z < 0.4667) = P(Z < 0.4667) - P(Z < -1.4)

= 0.6788 - 0.0808

= 0.5980

So the probability that the average of the sample will be between 143 and 147 minutes is 0.5980.

To find the 60th percentile for the average of these 49 marathons, we need to find the z-score such that the area to the left of the z-score is 0.6. Using a standard normal distribution table or calculator, we find:

P(Z < z) = 0.6

z = 0.25

Then, we can solve for the corresponding value of X:

0.25 = (X - 146) / (15/7)

X = 148.25

So the 60th percentile for the average of these 49 marathons is 148.25 minutes.

To find the median of the average running times, we note that the median of a normal distribution is equal to its mean. Therefore, the median of the average running times is 146 minutes.

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Answer:

0.718 = 71.8% probability that X is less than 38 minutes

Step-by-step explanation:

Exponential distribution:

The exponential probability distribution, with mean m, is described by the following equation:

[tex]f(x)=\mu e^{-\mu x}[/tex]

In which [tex]\mu=\frac{1}{m}[/tex] is the decay parameter.

The probability that x is lower or equal to a is given by:

[tex]P(X\leq x)=\int\limits^a_0f ({x)} \, dx[/tex]

Which has the following solution:

[tex]P(X\leq x)=1-e^{-\mu x}[/tex]

If X has an average value of 30 minutes

This means that [tex]m=30,\mu=\frac{1}{30}[/tex]

What is the probability that X is less than 38 minutes?

[tex]P(X\leq 38)=1-e^{-\frac{38}{30} }[/tex]

0.718 = 71.8% probability that X is less than 38 minutes

Answer:

The cyclist has travelled a distance of 931.888 meters.

Answer:

True

Step-by-step explanation:

A parallelogram has four sides so it's a quadrilateral

1. The diagonals are equal. Rectangle

2. All sides are equal, and one angle is 60°. Rhombus

3. All sides are equal, and one angle is 90°. Square

4. It has all the properties of parallelogram, rectangle, and rhombus. Square

5. It is an equilateral parallelogram. Rhombus

A rectangle is a four-sided figure with two sets of parallel sides, with each side being a different length. The opposite sides of a rectangle are always equal in length, so the angles of a rectangle are all 90 degrees. A rectangle can also be referred to as a quadrilateral.

A rhombus is a four-sided figure with all sides the same length. The angles of a rhombus are not all 90 degrees, but the opposite sides of a rhombus are equal in length. A rhombus can also be referred to as a diamond.

A square is a four-sided figure with all sides being the same length and all angles being 90 degrees. A square can also be referred to as a regular quadrilateral.

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The complete question is:

Identify whether the following statements describe a rectangle, rhombus or square.

1. The diagonals are equal. ____________

2. All sides are equal, and one angle is 60°. ____________

3. All sides are equal, and one angle is 90°. ____________

4. It has all the properties of parallelogram, rectangle, and rhombus. ____________

5. It is an equilateral parallelogram. ____________

The vertical forces on block A are: the force of gravity acting downwards with a magnitude of 40 N, and the normal force of the wall acting upwards with a magnitude of 40 N. It is not possible to determine the magnitude of the frictional force between block A and block B without knowing the coefficient of static friction.

The force of gravity on block A is equal to its mass (4 kg) times the acceleration due to gravity (10 m/s^2), which gives a magnitude of 40 N. Since block A is in contact with the wall, there must be a normal force acting on it from the wall to counteract the force of gravity. This normal force has the same magnitude as the force of gravity on block A. Therefore, the magnitude of the normal force of the wall on block A is also 40 N.

The frictional force between block A and block B depends on the coefficient of static friction between the two surfaces in contact and the normal force of block A on block B. Since we are not given the coefficient of static friction, we cannot determine the magnitude of the frictional force.

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Answer: 314 square meters

Step-by-step explanation:

The formula for the area of a circle is given by A = πr^2, where r is the radius of the circle. Since the diameter of the circular patch is given as 20 meters, the radius would be half of that or 10 meters.

So, using the formula, we can calculate the area of the circular patch as follows:

A = πr^2

A = π(10)^2

A = 3.14(100)

A = 314 square meters

Therefore, the area of the circular patch is 314 square meters.

The objective function that must be minimized is:

z = 40x + 50y

subject to the constraints:

0x + 4y ≥ 4 (protein constraint)

3x + 2y ≥ 11 (carbohydrate constraint)

2x + 4y ≤ 16 (fat constraint)

We want to find the number of ounces of fruit (x) and nuts (y) that will meet the requirement with the least number of calories.

Solving the system of inequalities, we get:

x = 2 ounces

y = 2 ounces

Therefore, the dietician should use 2 ounces of fruit and 2 ounces of nuts. These amounts will have a total of 180 calories (402 + 502).

Answer:

Step-by-step explanation:

Let's assume we need x ounces of fruit and y ounces of nuts to meet the requirements with the least number of calories. Then, the problem can be expressed as an optimization problem:

Minimize: 40x + 50y (since we want to minimize the number of calories) Subject to:

0x + 4y ≥ 4 (we need at least 4 units of protein)3x + 2y ≥ 11 (we need at least 11 units of carbohydrates)2x + 4y ≤ 16 (we cannot have more than 16 units of fat)

To solve this problem, we can use the simplex method. First, we convert the problem to standard form by introducing slack variables:

Minimize: 40x + 50y Subject to:

0x + 4y + s1 = 43x + 2y + s2 = 112x + 4y + s3 = 16

Now we can create the initial simplex tableau:

xys1s2s3RHSs1041004s23201011s32400116z-40-500000

We want to find the minimum value of z, so we need to choose the variable with the most negative coefficient in the bottom row as the entering variable. In this case, that is y. We then choose the variable with the smallest non-negative ratio between the right-hand side and the coefficient of the entering variable in its row as the leaving variable. In this case, that is s3, since 16/4 = 4 is the smallest non-negative ratio.

We then perform the pivot operation to eliminate the coefficient of y in the other rows:

     x  y  s1s2s3RHSs1001-214y3/2101/2-1/24s2-1001-1/25z-100025-15200

We repeat this process until all the coefficients in the bottom row are non-negative. The final tableau is:

x

The number of fractions between 0 and 1 (inclusive) with a denominator of 15 can be found using the formula (n-1)/n, where n is the denominator.

So, to answer your question, we can use the formula and plug in 15 for the value of n:

(15-1)/15 = 14/15

Therefore, there are 14 fractions between 0 and 1 (inclusive) with a denominator of 15.

so as we speak, the subfunctions are discontinued, the 1st goes close to 2 and who knows what happens it goes somewheres, the 2nd one makes it to 2.

we know that since the 2nd one makes to 2, to x = 2 that is, well, f(2) = kx, well, let's make f(2) for the 2nd one be equal to the 1st one then, if both they equate each other, that's where they meet, at x = 2.

[tex]f(x)= \begin{cases} k^2-24x,&x > 2\\\\ kx,&x\leqslant 2 \end{cases} \\\\[-0.35em] ~\dotfill\\\\ k^2-24x~~ = ~~kx\hspace{5em}\stackrel{\textit{now let's go to f(2)}}{k^2 - 24(2)~~ = ~~k(2)}\implies k^2-48=2k \\\\\\ k^2-2k-48=0\implies (k-8)(k+6)=0\implies \boxed{k= \begin{cases} 8\\ -6 \end{cases}}[/tex]

Here is a step-by-step explanation for your problem:

Step 1: Calculate the amount of the first deposit after one year

First deposit: $20,839

Interest earned on first deposit: (20,839 x 10.91%) = $2,269.82

Total amount after one year: 20,839 + 2,269.82 = $23,108.82

Step 2: Calculate the amount of the second deposit after one year

Second deposit: $22,872

Interest earned on second deposit: (22,872 x 10.91%) = $2,511.33

Total amount after one year: 22,872 + 2,511.33 = $25,383.33

Step 3: Calculate the amount of the final deposit after one year

Final deposit: $20,217

Interest earned on final deposit: (20,217 x 10.91%) = $2,214.93

Total amount after one year: 20,217 + 2,214.93 = $22,432.93

Step 4: Calculate the total amount available after four years

Total amount available after four years = 23, 108.82 + 25,383.33 + 22,432.93 = $71,925.08