Determine if the triangles below are similar. If they are, give the rule that you used to determine similarity.

Answer:

$30

Step-by-step explanation:

17+13

The simplified form of the original expression (√2 + √3) / √98 is (√14 + √21) / 14√7.

To simplify the expression (√2 + √3) / √98, we need to rationalize the denominator. Rationalizing the denominator means simplifying it so that there are no radical terms in the denominator.

First, we can simplify the denominator by factoring 98 as a product of its prime factors:

98 = 2 x 7 x 7

We can then express the square root of 98 as a product of the individual square roots of its prime factors:

√98 = √(2 x 7 x 7) = √2 x √7 x √7

Next, we can substitute this expression into the original fraction:

(√2 + √3) / √98 = (√2 + √3) / (√2 x √7 x √7)

Now, we need to rationalize the denominator by multiplying both the numerator and denominator by a suitable factor so that the denominator becomes a perfect square. In this case, we can multiply the fraction by √7/√7, which is equivalent to 1:

(√2 + √3) / (√2 x √7 x √7) x (√7/√7) = (√2 + √3) x √7 / (√2 x √7 x √7 x √7)

Simplifying the numerator gives:

(√2 + √3) x √7 = √14 + √21

Therefore, the simplified form of the original expression (√2 + √3) / √98 is (√14 + √21) / 14√7. This is the final answer in simplified form with a rationalized denominator.

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The real square roots of 1/9 are +1/3 and -1/3.

To find the square root of 1/9, we need to determine the value that, when squared, equals 1/9.

The square root of a number x is denoted by √x. In this case, we are looking for √(1/9).

The square root of 1/9 can be simplified by noting that 1/9 is equivalent to (1/3)².

Therefore, √(1/9) = √[(1/3)²] = 1/3.

Since the square root operation has two possible results, positive and negative, the real square roots of 1/9 are +1/3 and -1/3.

Hence, the real square roots of 1/9 are +1/3 and -1/3.

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The equation y = -x² + 9 accurately represents the path of the ball as it moves back and forth between you and your friend, with the ball's height at each horizontal position governed by the parabolic trajectory of the equation.

The equation that models the path of the ball in standard form is y = -x² + 9. This equation represents a downward-opening parabola that accurately represents the trajectory of the ball as it moves back and forth between you and your friend at a height of 3 feet.

The reasoning behind this equation is as follows:

Since the ball is being tossed back and forth at waist level, the height of the ball can be represented by the y-coordinate. The x-coordinate represents the horizontal distance from the person throwing the ball. We can assume that the ball is initially thrown from a position of x = 0.

To model the trajectory, we consider that the ball starts at a height of 3 feet and then follows a parabolic path. The negative coefficient in front of the x² term indicates that the parabola opens downward.

The constant term, 9, represents the maximum height of the ball. Since the ball is being tossed at waist level (3 feet), the maximum height reached by the ball is 3 + 6 = 9 feet. The additional 6 feet accounts for the vertical displacement of the ball from its starting height of 3 feet.

Therefore, the equation y = -x² + 9 accurately represents the path of the ball as it moves back and forth between you and your friend, with the ball's height at each horizontal position governed by the parabolic trajectory of the equation.

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The expression √-24 can be simplified using the imaginary unit i as 2i√6.

To simplify √-24, we can break it down into two parts: the square root of -1 (which is represented by the imaginary unit i) and the square root of 24.

The square root of -1 is i, and the square root of 24 can be simplified as 2√6.

Combining these two parts, we get 2i√6 as the simplified form of √-24.

The imaginary unit i is defined as the square root of -1. It is used to represent imaginary numbers, which are numbers that involve the square root of a negative number. In this case, the expression involves the square root of -24, which is a negative number. By using the imaginary unit i, we can simplify √-24 as 2i√6, where 2 is the coefficient and √6 is the remaining radical term.

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The standard deviation of 5, 9, 9, 1, 5, 7, 6 rounded to the nearest tenth is 2.6.

Step 1: Calculate the mean

Mean = (5 + 9 + 9 + 1 + 5 + 7 + 6) / 7 = 42 / 7 = 6

Step 2: Subtract the mean and square the differences

[tex](5 - 6)^2[/tex] = 1

[tex](9 - 6)^2[/tex] = 9

[tex](9 - 6)^2[/tex] = 9

[tex](1 - 6)^2[/tex] = 25

[tex](5 - 6)^2[/tex] = 1

[tex](7 - 6)^2[/tex] = 1

[tex](6 - 6)^2[/tex] = 0

Step 3: Calculate the mean of the squared differences

Mean = (1 + 9 + 9 + 25 + 1 + 1 + 0) / 7 = 46 / 7 = 6.5714

Step 4: Take the square root of the mean

Standard Deviation = sqrt(6.5714) ≈ 2.5651

Rounded to the nearest tenth, the standard deviation is approximately 2.6.

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The volume of the rectangular box is 360.0956928 cm³.The number of kilograms of mercury in the given rectangular box is approximately 0.0049 kg.

To calculate the volume of a rectangular box, we multiply its length, width, and height together. Given the dimensions:

Length = 42.6 cm

Width = 4.41 cm

Height = 1.932 cm

Volume = Length * Width * Height

Volume = 42.6 cm * 4.41 cm * 1.932 cm

Volume = 360.0956928 cm³

Therefore, the volume of the rectangular box is 360.0956928 cm³.

To calculate the number of kilograms of mercury, we need to know the density of mercury. The density of mercury is approximately 13.6 g/cm³.

To convert the volume from cubic centimeters to cubic meters, we divide by 1,000,000 (since 1 cubic meter is equal to 1,000,000 cubic centimeters):

Volume (in cubic meters) = Volume (in cubic centimeters) / 1,000,000

Volume (in cubic meters) = 360.0956928 cm³ / 1,000,000

Volume (in cubic meters) = 0.0003600956928 m³

To calculate the mass of mercury, we multiply the volume by the density:

Mass = Volume (in cubic meters) * Density

Mass = 0.0003600956928 m³ * 13.6 g/cm³

Note that we need to convert grams to kilograms by dividing by 1000:

Mass = (0.0003600956928 m³ * 13.6 g/cm³) / 1000

Mass = 0.0048972970272 kg

Therefore, the number of kilograms of mercury in the given rectangular box is approximately 0.0049 kg.

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Step-by-step explanation:

45 degrees east of south ( 180 degrees)  would be

   180 - 45 = 135 degrees  compass

The Mean Absolute Percentage Error (MAPE) for a four-month moving average method applied to the given patient data is 13.7196%.

To calculate the MAPE using a four-month moving average method, we need to find the average of the absolute percentage errors for each month's forecasted value compared to the actual value.

First, we calculate the four-month moving average for each month using the provided data:

Moving Average for Month 1 = (593 + 464 + 618 + 765) / 4 = 610

Moving Average for Month 2 = (464 + 618 + 765 + 553) / 4 = 600

Moving Average for Month 3 = (618 + 765 + 553 + 731) / 4 = 666.75

Moving Average for Month 4 = (765 + 553 + 731 + 647) / 4 = 674

Moving Average for Month 5 = (553 + 731 + 647) / 3 = 643.67

Moving Average for Month 6 = (731 + 647) / 2 = 689

Moving Average for Month 7 = 647

Next, we calculate the absolute percentage error for each month's forecasted value compared to the actual value:

APE for Month 1 = |(610 - 593) / 593| = 0.0287

APE for Month 2 = |(600 - 464) / 464| = 0.2927

APE for Month 3 = |(666.75 - 618) / 618| = 0.0789

APE for Month 4 = |(674 - 765) / 765| = 0.1183

APE for Month 5 = |(643.67 - 553) / 553| = 0.1630

APE for Month 6 = |(689 - 731) / 731| = 0.0575

APE for Month 7 = |(647 - 647) / 647| = 0

Finally, we find the average of the absolute percentage errors and multiply it by 100 to obtain the MAPE:

MAPE = (0.0287 + 0.2927 + 0.0789 + 0.1183 + 0.1630 + 0.0575 + 0) / 7 * 100 ≈ 13.7196%

Therefore, the value of MAPE (in percent) for the four-month moving average method applied to the given patient data is approximately 13.7196%.

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The complete solution set of 3/(x²-1) + 4x/(x+1) = 1.5/(x-1) is x = 1, 0.375.

To determine the complete solution set of 3/(x²-1) + 4x/(x+1) = 1.5/(x-1)

Convert in quadratic equation

3/(x²-1) + 4x/(x+1) = 1.5/(x-1) = 0

3/(x²-1) + 4x/(x+1) - 1.5/(x-1) = 0

[3 + (x -1)(4x) - 1.5(x- 1)]/(x + 1)(x - 1) = 0

4x²- 5.5x + 1.5 = 0

Determine roots,

4x(x² - 1) - 1.5(x - 1) = 0

x = 1, 0.375

Therefore, the complete solution set of 3/(x²-1) + 4x/(x+1) = 1.5/(x-1) is x = 1, 0.375.

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Angle HLI is equal to 180 - 2x degrees.

The given information states that angle GLH is congruent to angle ILM. Let's denote angle ILM as x.

Therefore, angle GLH is also x. We are also given that angle KLM is 5 times angle ILM, so angle KLM is 5x. Additionally, it is stated that angle GLI is twice angle GLH, which means angle GLI is 2x.

To find angle HLI, we need to subtract angle GLI from 180 degrees since the sum of angles in a triangle is 180 degrees. Therefore, angle HLI is equal to 180 - 2x.

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The profit of a perfectly competitive firm is calculated using the production function. The firm should adjust capital employment based on marginal returns and costs to maximize profits.

To calculate the profit, substitute the given values of labor, capital, and input prices into the production function and subtract the total cost from total revenue.

The profit-maximizing quantity of capital can be determined by taking the derivative of the profit function with respect to capital and setting it equal to zero.

This will provide the optimal capital level that maximizes profits. Comparing the profit at the current capital level to the profit at other potential capital levels can indicate whether increasing or decreasing capital employment will result in higher profits.

This decision should be based on evaluating the marginal returns of capital, considering factors such as diminishing returns and the cost of additional capital units.

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For n = 50, the standard deviation of the sampling distribution is σY/√n = 7.21. So, Pr(ˉY<91) = 0.8365, and for n = 166, the standard deviation of the sampling distribution is σY/√n = 2.82. So, Pr(91<ˉY<94) = 0.5987.

The central limit theorem states that the sampling distribution of the sample mean, ˉY, will be normally distributed with mean μY and standard deviation σY/√n, where n is the sample size.

The theorem states that, as the sample size increases, the sampling distribution of the sample mean will approach a normal distribution, regardless of the shape of the population distribution.

This means that we can use the normal distribution to calculate probabilities about the sample mean, even when we don't know the shape of the population distribution.

In this problem, we were able to use the central limit theorem to calculate the probability that the sample mean would be less than 91 and the probability that the sample mean would be between 91 and 94. These probabilities were calculated using the standard normal distribution, which is a table of probabilities for the normal distribution.

In this problem, we are given that μY = 90 and σY2 = 52. We are asked to find Pr(ˉY<91) and Pr(91<ˉY<94) for two different sample sizes, n = 50 and n = 166.

For n = 50, the standard deviation of the sampling distribution is σY/√n = 7.21. So, Pr(ˉY<91) = 0.8365.

For n = 166, the standard deviation of the sampling distribution is σY/√n = 2.82. So, Pr(91<ˉY<94) = 0.5987.

In conclusion, the central limit theorem allows us to use the normal distribution to approximate the sampling distribution of the sample mean, even when the population distribution is not normally distributed.

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The function (h(t) = -4.9t^2 + 19.6t) is used to model the height of an object projected in the air, where (h(t)) represents the height (in meters) and (t) represents the time (in seconds).

This is a quadratic function in the form (h(t) = at^2 + bt + c), where:

The coefficient of (t^2), (a), is -4.9.

The coefficient of (t), (b), is 19.6.

There is no constant term, so (c) is 0.

In this specific function, the coefficient of (t^2) is negative (-4.9), indicating that the quadratic term has a downward-facing parabolic shape. This means that the height of the object will initially increase, reach a maximum point, and then decrease over time.

The coefficient of (t) (19.6) represents the initial velocity or speed of the object. It determines the rate at which the height changes with respect to time.

By using this function, you can substitute different values of (t) to calculate the corresponding height of the object at various points in time.

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He answers rounded to the correct number of decimals/sig. figs are:a. 15.0 b. 408.1 c. 369 d. 68.65

a. 12.5849+2.4Adding 12.5849 and 2.4 gives: 15. 0 (rounded to one decimal place)  b. 432.5−24.3984Subtracting 24.3984 from 432.5 gives: 408. 1 (rounded to one decimal place)  c. 246×1.5Multiplying 246 and 1.5 gives: 369 (no rounding required)  d. 974.59/14.2Dividing 974.59 by 14.2 gives: 68.65 (rounded to two decimal places)

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The inequality 6x - 13 < 6 (x - 2) is always true. 0 < 1 is always true so, the inequality is always true for any value of x.

When we simplify the inequality, we have 6x - 13 < 6x - 12.

6x - 13 < 6x - 12

or, 6x - 6x < 13 - 12

or, 0 < 1

Notice that the x-terms cancel out, resulting in 0 < 1.

In the comparison 0 < 1, the left side 0 is indeed less than the right side 1, making the inequality true. This holds true for all values of x.

Since the inequality is true regardless of the value of x, we can conclude that the original inequality 6x - 13 < 6 (x - 2) is always true.

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The solution to the equation 2/(x - 1) = 4 is x = 3. To solve the equation, we need to isolate the variable x.

First, we can start by multiplying both sides of the equation by (x - 1) to eliminate the denominator. This gives us 2 = 4(x - 1). Next, we can distribute 4 to the terms inside the parentheses, resulting in 2 = 4x - 4. To isolate the variable, we can add 4 to both sides of the equation, giving us 6 = 4x. Finally, we divide both sides by 4 to solve for x, yielding x = 3.

To check our solution, we substitute x = 3 back into the original equation. We have 2/(3 - 1) = 2/2 = 1, which is indeed equal to 4. Therefore, x = 3 is the correct solution to the equation.

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From the question that we have;

1) P(t) = Po[tex]e^{rt}[/tex]

2) After seven hours we have 5003

3) The rate is 0.23

Exponential growth is a type of growth in which a quantity or population grows over time at an ever-increasing rate.

We have that;

P(t) = Po[tex]e^{rt}[/tex]

P(t) = Population at time t

Po = Initial population

r = rate of growth

t = time taken

Thus;

2(1000) = 1000[tex]e^{3r}[/tex]

2 = [tex]e^{3r}[/tex]

r = ln2/3

r = 0.23

After seven hours;

P(t) =1000[tex]e^{7(0.23)}[/tex]

= 5003

The rate of growth at seven hours;

5003 = 1000[tex]e^{7r}[/tex]

5003/1000 = [tex]e^{7r}[/tex]

r = 0.23

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The given matrix [4 7; 3 5] has an inverse. The inverse matrix is [5 -7; -3 4].

To determine if a matrix has an inverse, we need to check if its determinant is nonzero. Let's denote the given matrix as A: A = [4 7; 3 5]

The determinant of A, denoted as det(A), can be calculated by cross-multiplying and subtracting: det(A) = (4 * 5) - (7 * 3)

      = 20 - 21

      = -1

Since the determinant is nonzero (-1 ≠ 0), the matrix A has an inverse.

To find the inverse matrix, we can use the formula:

[tex]A^(-1)[/tex]= (1/det(A)) * adj(A)

Where adj(A) represents the adjugate of matrix A, obtained by swapping the elements of the main diagonal and changing the sign of the off-diagonal elements. Applying the formula, we have:

[tex]A^(-1)[/tex] = (1/(-1)) * [5 -7; -3 4]

      = [-5 7; 3 -4]

Therefore, the inverse of the given matrix [4 7; 3 5] is [5 -7; -3 4].

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Answer (25-30 words): In point 7 and 8, the concept of surveys is repeated because research techniques refer to the overall approach, while data collection specifically focuses on the method used to gather data.

In research methodology, point 7 refers to the research techniques employed, which in this case is surveys. Surveys are a common method for gathering data in quantitative research. Point 8, on the other hand, specifies the data collection process, which again involves the use of surveys. While it may seem repetitive to mention surveys twice, it is important to differentiate between the broader research technique (point 7) and the specific method used to collect data (point 8).

The research technique, surveys, encompasses the overall approach of using questionnaires or interviews to collect data from respondents. It represents the methodology chosen to gather information. On the other hand, data collection focuses on the actual process of administering the surveys and collecting responses from the target population.

By including both points, the outline or concept map reflects the distinction between the research technique (surveys) and the specific step of data collection using surveys. This ensures clarity and precision in describing the methodology.

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There are 30° between every two consecutive numbers on an analog clock.

Given that on an analog clock, the minute hand moved 128° in an hour we need to find the numbers it has pass next,

On an analog clock, the minute hand completes a full revolution of 360° in 60 minutes.

This means that each minute corresponds to a movement of 360°/60 = 6°.

The minute hand has moved 128° from the hour, we can determine the number of minutes it has traveled by dividing 128° by 6°:

128° / 6° = 21.33 minutes

Since the minute hand has moved beyond 21 minutes, it will pass the next number on the clock.

If we consider the current number to be n, then it will pass the number (n+1) next.

To find the number of degrees between every two consecutive numbers on an analog clock, we divide the total degrees in a circle (360°) by the number of divisions on the clock face (12 numbers):

360° / 12 = 30°

Therefore, there are 30° between every two consecutive numbers on an analog clock.

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Answer:

"The Theory of Evolution"

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To simplify the expression (2x² + 5x + 2) / (4x² - 1) * (2x² + x - 1) / (x² + x - 2), we multiply the numerators and the denominators.

To multiply the given expression, we multiply the numerators and the denominators separately. The numerator becomes (2x² + 5x + 2) * (2x² + x - 1), and the denominator becomes (4x² - 1) * (x² + x - 2). We can expand both the numerator and the denominator using the distributive property and then simplify the resulting expression.

After multiplying the numerators, we obtain (2x^2 + 5x + 2) * (2x^2 + x - 1) = 4x^4 + 4x^3 + x^2 + 7x^2 + 5x^2 + 2x - 2x - x - 2. Simplifying this expression gives us 4x^4 + 4x^3 + 13x^2 + x - 2.

Similarly, when multiplying the denominators, we have (4x^2 - 1) * (x^2 + x - 2) = 4x^4 + 4x^3 - x^2 - x - 8x^2 - 8x + 2x^2 + 2 + 4. Simplifying this expression results in 4x^4 + 4x^3 - 7x^2 - 9x - 4.

Thus, the simplified expression is (4x^4 + 4x^3 + 13x^2 + x - 2) / (4x^4 + 4x^3 - 7x^2 - 9x - 4). As for restrictions on the variables, we need to consider the denominators of the original expression. In this case, the denominator (4x² - 1) cannot be equal to zero, and the denominator (x² + x - 2) also cannot be zero, as division by zero is undefined. Therefore, the restrictions on the variables are x ≠ ±1/2 and x ≠ -2, +1.

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The probability that the people will occupy k adjacent chairs in the circle is k!(n-1) / (n-1)!.

To find out the probability of people occupying k adjacent chairs, we need to divide the total number of ways in which k people can be seated to the total number of possible seating arrangements. The total number of possible seating arrangements with n chairs is (n-1)! as first person will take a seat and then the remaining n-1 people will be arranged.

Now, for the seating arrangement of k people in adjacent manner, we know that one person's position is fixed so, the remaining (k-1) people can be arranged in (k-1)! ways. however, adjacent chairs can start from any position. Therefore, the total number of arrangements of k people occupying k adjacent chairs is k!(n-1).

Thus, the probability that the people will occupy k adjacent chairs in the circle will be k!(n-1) / (n-1)!.

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For a 30-degree angle, the sine (sin) is approximately 0.5, the cosine (cos) is approximately 0.866, and the ratio sinθ/cosθ is approximately 0.577. These values represent the trigonometric functions of the given angle.

The sine (sin) and cosine (cos) functions represent the ratio of the lengths of the sides of a right triangle. For a 30-degree angle in a right triangle, the sides are in the ratio 1:√3:2. Using this information, we can find the sine and cosine values.

sin(30 degrees) ≈ 0.5

cos(30 degrees) ≈ 0.866

Now, we can calculate the ratio sinθ/cosθ:

sinθ/cosθ = (0.5)/(0.866)

Dividing these values, we get:

sinθ/cosθ ≈ 0.577

Rounded to the nearest thousandth, the ratio sinθ/cosθ for a 30-degree angle is approximately 0.577.

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In the function g(x) = f(x + 1), the value of h is 1. This means that the graph of g(x) is shifted 1 unit to the left compared to the graph of f(x).

A horizontal translation of a function is a transformation that moves the graph of the function to the left or right by a certain number of units. In this case, the function g(x) is defined as f(x + 1). This means that for every input value x, the output value of g(x) is the same as the output value of f(x), but shifted one unit to the left.

For example, if x = 0, then g(0) = f(1). This means that the point (0, g(0)) on the graph of g(x) is the same point as the point (1, f(1)) on the graph of f(x).

The graph of g(x) is therefore shifted one unit to the left compared to the graph of f(x). This is because the input value x = 0 on the graph of g(x) corresponds to the input value x = 1 on the graph of f(x).

In conclusion, the value of h in g(x) = f(x + 1) is 1. This means that the graph of g(x) is shifted 1 unit to the left compared to the graph of f(x).

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The rule for how many significant figures you are able to get using a measuring instrument is that the number of significant figures is equal to the number of digits that are certain plus one digit that is estimated.

For example, if you measure a length with a ruler that has marks every millimeter, then you can report the length to two significant figures, such as 3.5 cm. The 3 is certain because it is a whole number that is marked on the ruler. The 5 is estimated because it is the value between the 4 and 6 marks on the ruler.

* The number of significant figures in a measurement is determined by the least precise digit.

* The least precise digit is the digit that is estimated.

* The other digits in the measurement are certain.

* For example, in the measurement 3.5 cm, the least precise digit is the 5. This digit is estimated because it is the value between the 4 and 6 marks on the ruler. The 3 is certain because it is a whole number that is marked on the ruler.

* Therefore, the measurement has two significant figures.

It is important to report the correct number of significant figures in a measurement. This is because it is a way of communicating the uncertainty of the measurement. If you report too many significant figures, you are giving the impression that your measurement is more precise than it actually is. If you report too few significant figures, you are not giving enough information about the uncertainty of your measurement.

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Answer:

[tex]\text{g}^{-1}(x)=\boxed{\dfrac{x-13}{2}}[/tex]

[tex]\left(\text{g}^{-1} \circ \text{g}\right)(-4)=\boxed{-4}[/tex]

[tex]h^{-1}(9)=\boxed{-3}[/tex]

Step-by-step explanation:

To find the inverse of function g(x) = 2x + 13, begin by replacing g(x) with y:

[tex]y=2x+13[/tex]

Swap x and y:

[tex]x=2y+13[/tex]

Rearrange to isolate y:

[tex]\begin{aligned}x&=2y+13\\\\x-13&=2y+13-13\\\\x-13&=2y\\\\2y&=x-13\\\\\dfrac{2y}{2}&=\dfrac{x-13}{2}\\\\y&=\dfrac{x-13}{2}\end{aligned}[/tex]

Replace y with g⁻¹(x):

[tex]\boxed{\text{g}^{-1}(x)=\dfrac{x-13}{2}}[/tex]

[tex]\hrulefill[/tex]

As g and g⁻¹ are true inverse functions of each other, the composite function (g⁻¹ o g)(x) will always yield x. Therefore, (g⁻¹ o g)(-4) = -4.

To prove this algebraically, calculate the original function g at the input value x = -4, and then evaluate the inverse function of g at the result.

[tex]\begin{aligned}\left(\text{g}^{-1} \circ \text{g}\right)(-4)&=\text{g}^{-1}\left[\text{g}(-4)\right]\\\\&=\text{g}^{-1}\left[2(-4)+13\right]\\\\&=\text{g}^{-1}\left[5\right]\\\\&=\dfrac{(5)-13}{2}\\\\&=\dfrac{-8}{2}\\\\&=-4\end{aligned}[/tex]

Hence proving that (g⁻¹ o g)(-4) = -4.

[tex]\hrulefill[/tex]

The inverse of a one-to-one function is obtained by reflecting the original function across the line y = x, which swaps the input and output values of the function. Therefore, (x, y) → (y, x).

Given the one-to-one function h is defined as:

[tex]h=\left\{(-3,9), (1,0), (3,-7), (5,2), (9,6)\right\}[/tex]

Then, the inverse of h is defined as:

[tex]h^{-1}=\left\{(9,-3),(0,1),(-7,3),(2,5),(6,9)\right\}[/tex]

Therefore, h⁻¹(9) = -3.

The calculated length of the segment BC is 14.5 cm

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

The triangle

Using the sine rule, we have

Sin (65)= BC/ 16

So, we have

BC = 16 * sin(65)

When evaluated, we have

BC = 14.5

Hence, the length of the segment BC is 14.5 cm

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(a) Forecast: Linear regression  the next year is approx 191.6007.

(b) MSE: Mean Squared Error is approximately 249.1585.

(c) MAPE: Mean Absolute Percent Error is approximately 10.42%.

(a) (a) Forecast using linear regression:
To forecast the number of disk drives for the next year, we can use linear regression to fit a line to the given data points. The linear regression equation is of the form y = mx + b, where y represents the number of disk drives and x represents the year.

Calculating the slope (m):
m = (Σ(xy) - n(Σx)(Σy)) / (Σ(x^2) - n(Σx)^2)

Σ(xy) = (1)(140) + (2)(160) + (3)(190) + (4)(200) + (5)(210) = 2820
Σ(x) = 1 + 2 + 3 + 4 + 5 = 15
Σ(y) = 140 + 160 + 190 + 200 + 210 = 900
Σ(x^2) = (1^2) + (2^2) + (3^2) + (4^2) + (5^2) = 55

m = (2820 - 5(15)(900)) / (55 - 5(15)^2)
m = (2820 - 6750) / (55 - 1125)
m = -3930 / -1070
m ≈ 3.6729

Calculating the y-intercept (b):
b = (Σy - m(Σx)) / n
b = (900 - 3.6729(15)) / 5
b = (900 - 55.0935) / 5
b ≈ 168.1813

Using the equation y = 3.6729x + 168.1813, where x represents the year, we can predict the number of disk drives for the next year. To do so, we substitute the value of x as the next year in the equation. Let's assume the next year is represented by x = 6:

y = 3.6729(6) + 168.1813
y ≈ 191.6007

Therefore, according to the linear regression model, the predicted number of disk drives for the next year is approximately 191.6007.

(b) Calculation of Mean Squared Error (MSE):

To calculate the Mean Squared Error (MSE), we need to compare the predicted values obtained from linear regression with the actual values given in the data.

First, we calculate the predicted values using the linear regression equation: y = 3.6729x + 168.1813, where x represents the year.

Predicted values:

Year 1: y = 3.6729(1) + 168.1813 = 171.8542
Year 2: y = 3.6729(2) + 168.1813 = 175.5271
Year 3: y = 3.6729(3) + 168.1813 = 179.2000
Year 4: y = 3.6729(4) + 168.1813 = 182.8729
Year 5: y = 3.6729(5) + 168.1813 = 186.5458
Next, we calculate the squared difference between the predicted and actual values, and then take the average:

MSE = (Σ(y - ŷ)^2) / n

MSE = ((140 - 171.8542)^2 + (160 - 175.5271)^2 + (190 - 179.2000)^2 + (200 - 182.8729)^2 + (210 - 186.5458)^2) / 5

MSE ≈ 249.1585

The Mean Squared Error (MSE) for the linear regression model is approximately 249.1585.

This value represents the average squared difference between the predicted values and the actual values, providing a measure of the accuracy of the model.

(c) Calculation of Mean Absolute Percent Error (MAPE):

To calculate the Mean Absolute Percent Error (MAPE), we need to compare the predicted values obtained from linear regression with the actual values given in the data.

First, we calculate the predicted values using the linear regression equation: y = 3.6729x + 168.1813, where x represents the year.

Predicted values:

Year 1: y = 3.6729(1) + 168.1813 ≈ 171.8542
Year 2: y = 3.6729(2) + 168.1813 ≈ 175.5271
Year 3: y = 3.6729(3) + 168.1813 ≈ 179.2000
Year 4: y = 3.6729(4) + 168.1813 ≈ 182.8729
Year 5: y = 3.6729(5) + 168.1813 ≈ 186.5458

Next, we calculate the absolute percent error for each year, which is the absolute difference between the predicted and actual values divided by the actual value, multiplied by 100:

Absolute Percent Error (APE):

Year 1: |(140 - 171.8542) / 140| * 100 ≈ 18.467
Year 2: |(160 - 175.5271) / 160| * 100 ≈ 9.704
Year 3: |(190 - 179.2000) / 190| * 100 ≈ 5.684
Year 4: |(200 - 182.8729) / 200| * 100 ≈ 8.563
Year 5: |(210 - 186.5458) / 210| * 100 ≈ 11.682
Finally, we calculate the average of the absolute percent errors:

MAPE = (APE₁ + APE₂ + APE₃ + APE₄ + APE₅) / n

MAPE ≈ (18.467 + 9.704 + 5.684 + 8.563 + 11.682) / 5 ≈ 10.42

The Mean Absolute Percent Error (MAPE) for the linear regression model is approximately 10.42%.

This value represents the average percentage difference between the predicted values and the actual values, providing a measure of the relative accuracy of the model.

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