the number of televisions in a small town, use the frequency distribution to construct a probability distribution

Rounded to the nearest hundredth, the solutions to the equation [tex]2y^2 = 4y - 1,[/tex] obtained by completing the square, are approximately:

[tex]y \approx 1 + 0.87 \approx 1.87\\y \approx 1 - 0.87 \approx 0.13[/tex]

To solve equation 2[tex]y^2 = 4y - 1[/tex] by completing the square, we can follow these steps:

Step 1: Move the constant term (-1) to the right side of the equation:

[tex]2y^2 - 4y = 1[/tex]

Step 2: Divide the entire equation by the coefficient of y² (2) to make the coefficient 1:

[tex]y^2 - 2y = 1/2[/tex]

Step 3: Take half of the coefficient of y (-2), square it, and add it to both sides of the equation to complete the square:

[tex]y^2 - 2y + (-2/2)^2 = 1/2 + (-2/2)^2\\y^2 - 2y + 1 = 1/2 + 1[/tex]

Simplifying the right side:

[tex]y^2 - 2y + 1 = 1/2 + 2/2\\y^2 - 2y + 1 = 3/2[/tex]

Step 4: Factor the left side of the equation:

[tex](y - 1)^2 = 3/2[/tex]

Step 5: Take the square root of both sides, considering both the positive and negative square roots:

[tex]y - 1 = \pm \sqrt{(3/2)[/tex]

Step 6: Solve for y by adding 1 to both sides:

[tex]y = 1 \pm \sqrt{(3/2)[/tex]

Rounded to the nearest hundredth, the solutions to the equation [tex]2y^2 = 4y - 1,[/tex] obtained by completing the square, are approximately:

[tex]y \approx 1 + 0.87 \approx 1.87\\y \approx 1 - 0.87 \approx 0.13[/tex]

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Rounding the 14th partial sum to the thousandths place, we get A. 1333.252. Therefore, the correct answer is A. 1,333.252.

To find the 14th partial sum of the given series, we need to evaluate the sum of the first 14 terms.

The series alternates between adding and subtracting values, starting with 2000 as the first term, and each subsequent term being half of the previous term.

Let's break down the series:

Term 1: 2000

Term 2: -1000

Term 3: 500

Term 4: -250

We can see that each term alternates signs, and the magnitude of each term is halved compared to the previous term.

To find the 14th partial sum, we can start by calculating the sum of the first few terms to identify a pattern:

First term: 2000

Second term: 2000 - 1000 = 1000

Third term: 1000 + 500 = 1500

Fourth term: 1500 - 250 = 1250

Fifth term: 1250 + 125 = 1375

Sixth term: 1375 - 62.5 = 1312.5

We observe that the magnitude of the terms is converging towards a value, but the alternating signs continue.

To find the 14th partial sum, we can continue this pattern until the 14th term:

Term 7: 1312.5 + 31.25 = 1343.75

Term 8: 1343.75 - 15.625 = 1328.125

Term 9: 1328.125 + 7.8125 = 1335.9375

Term 10: 1335.9375 - 3.90625 = 1332.03125

Term 11: 1332.03125 + 1.953125 = 1333.984375

Term 12: 1333.984375 - 0.9765625 = 1333.0078125

Term 13: 1333.0078125 + 0.48828125 = 1333.49609375

Term 14: 1333.49609375 - 0.244140625 = 1333.251953125

Rounding the 14th partial sum to the thousandths place, we get 1333.252.

Therefore, the correct answer is A. 1,333.252.

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For the given expenditure function e(p, u) = z(p1, p2)p^m3u, where m > 0, the restrictions that z(p1, p2) must satisfy to be a legitimate expenditure function are as follows:

Non-Negativity: The function z(p1, p2) must be non-negative for all values of p1 and p2. This means that the expenditure function cannot take negative values since expenditure cannot be negative in real-world scenarios.

Homogeneity of Degree 0: The function z(p1, p2) must satisfy the property of homogeneity of degree 0. This means that multiplying the prices by a positive scalar should not change the value of z(p1, p2). Mathematically, it can be expressed as z(tp1, tp2) = z(p1, p2) for all t > 0.

The expenditure function e(p, u) represents the minimum amount of expenditure required to achieve a given level of utility u, given the vector of prices p. In this case, the expenditure function is defined as e(p, u) = z(p1, p2)p^m3u, where m is a positive constant.

To ensure that this is a legitimate expenditure function, certain restrictions need to be met by the function z(p1, p2).

The first restriction is non-negativity. It ensures that the expenditure function does not produce negative expenditure values. This is important because in real-world scenarios, expenditure cannot be negative. Therefore, z(p1, p2) must be non-negative for all values of p1 and p2.

The second restriction is the property of homogeneity of degree 0. This property states that multiplying the prices by a positive scalar should not change the value of z(p1, p2). In other words, if we multiply all the prices by a positive constant, the resulting expenditure should remain the same. This condition is necessary for the expenditure function to accurately reflect the relationship between prices and expenditure.

By satisfying these restrictions, z(p1, p2) ensures that the expenditure function e(p, u) is valid and consistent with economic principles. It allows for meaningful analysis of the relationship between prices, expenditure, and utility in economic decision-making.

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The correct answer is: It would directly affect the y-values. The change of adding seven in the expression f(x) = (x + 7)³ would directly affect the y-values by shifting the function vertically

When the formula y = x³ is changed to f(x) = (x + 7)³ by adding seven to the original expression, it directly affects the y-values. The expression (x + 7)³ means that for each value of x, you add seven to it and then cube the result. This modification shifts the graph of the function vertically upwards by seven units.

The x-values, on the other hand, are not directly affected by this change. The x-values still represent the independent variable, which can take any real number as input to the function. Adding seven to the x-values would result in shifting the entire graph horizontally, not affecting the shape or nature of the function itself.

Therefore, the change of adding seven in the expression f(x) = (x + 7)³ would directly affect the y-values by shifting the function vertically, while the x-values would remain the same in terms of their range and behavior.

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To find the variance of 3ab, where a and b are two cards drawn from a bag numbered 1 through 6 without replacement, we need to calculate the expected value of 3ab and the expected value of (3ab)^2.

First, let's determine the expected value of 3ab. Since there are 6 cards numbered 1 through 6 and we draw two cards without replacement, there are a total of 6C2 = 15 possible pairs of cards. The expected value is then:

E(3ab) = (1/15) * (3 * 1 + 3 * 2 + 3 * 3 + 3 * 4 + 3 * 5 + 3 * 6)

= (1/15) * (3 + 6 + 9 + 12 + 15 + 18)

= (1/15) * 63

= 4.2

Next, let's calculate the expected value of (3ab)^2. Squaring the expected value of 3ab, we have:

E((3ab)^2) = (4.2)^2

= 17.64

Now, we can find the variance using the formula:

Variance = E((3ab)^2) - (E(3ab))^2

Variance = 17.64 - (4.2)^2

= 17.64 - 17.64

= 0

Therefore, the variance of 3ab, where a and b are two cards drawn without replacement from a bag numbered 1 through 6, is 0.

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Dée Trader's rate of return on her investment in Internet Dreams, considering the share price decrease and the interest expense, is 8.5%.

Dée Trader purchased 300 shares of Internet Dreams at $40 per share, resulting in an initial investment of $12,000 (300 shares * $40). However, since she borrowed $4,000, her out-of-pocket investment is $8,000 ($12,000 - $4,000).

At the end of the year, the share price falls to $30 per share. The market value of her investment is now 300 shares * $30, which equals $9,000.

Now, let's calculate the interest expense on the borrowed amount. The interest rate is 8%, so the interest expense for the year is 8% of $4,000, which equals $320.

To determine the net profit or loss, we subtract the initial investment and the interest expense from the market value of the investment. In this case, the net profit is ($9,000 - $8,000) - $320, which equals $680.

Finally, we can calculate the rate of return by dividing the net profit by the initial investment and expressing it as a percentage. The rate of return is ($680 / $8,000) * 100, which equals 8.5%.

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The value of variable Y is 6 and Z is 8. In other words, the value of Y is 6 and the value of Z is approximately 29.17.

To find the value of variable Y and Z, we can use the given information that Y is between X and Z. We are also given the values of X Y=6 b, Y Z=8 b, and X Z=175.

From the given information, we know that Y is between X and Z. Since Y is between X and Z, we can conclude that Y is greater than X and less than Z.

Therefore, Y must be 6, as it is the only value that satisfies this condition.

Now, we can find the value of Z by using the information

X Z=175.

Since X is 6, we can substitute this value into the equation to get 6 Z=175.

Solving for Z, we divide both sides of the equation by 6, giving us Z=29.17.

Therefore, the value of the variable Y is 6 and Z is approximately 29.17.

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The line perpendicular to y = 4 is a horizontal line with the equation y = c, where c is any constant.

The equation y = 4 represents a horizontal line with a constant y-value of 4. To find a line perpendicular to this, we need to consider a line that has a different slope.

A line is perpendicular to another line if and only if the product of their slopes is -1. The slope of the line y = 4 is 0 since it is a horizontal line. Therefore, the slope of a line perpendicular to y = 4 should be undefined or "no slope" since it is a vertical line.

The equation for a vertical line passing through any x-value, let's say x = c, is x = c. This line is perpendicular to y = 4 because the product of the slopes (0 * undefined) is -1.

In summary, the line perpendicular to y = 4 is a vertical line with the equation x = c, where c can be any constant.

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To repay a student loan of $25,000 over 12 years at an annual interest rate of 7% compounded monthly, the monthly payment amount would be approximately $241.93.

To calculate the monthly payment for the student loan, we can use the formula for the monthly payment amount (PMT) in the compound interest formula. In this case, the loan amount is $25,000, the loan duration is 12 years, and the annual interest rate is 7%. We need to convert the annual interest rate to a monthly interest rate, which is 7% divided by 12 (0.07/12 = 0.00583).

Using the following formula:

[tex]PMT = (r * A) / (1 - (1 + r)^(-n))[/tex]

where r is the monthly interest rate, A is the loan amount, and n is the total number of months.

Plugging in the values, we have:

[tex]PMT = (0.00583 * 25000) / (1 - (1 + 0.00583)^(-12*12))[/tex]

Calculating this expression, we find that the monthly payment for the student loan is approximately $241.93 when rounded to the nearest cent. Therefore, the monthly payment amount would be $241.93.

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The number of different designs possible using combination is 70.

The formula to calculate combinations is given by:

where n is the total number of items, and k is the number of items to be chosen.

In this scenario, we have:

Plugging these values into the formula, we get:

C(8, 4) = 8! / (4! * (8 - 4)!)

8! = 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1 = 40,320

4! = 4 * 3 * 2 * 1 = 24

Substituting the values:

C(8, 4) = 40,320 / (24 * 24) = 70

Therefore, there are 70 different designs possible.

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The range consists of the values of Paul's total daily pay for washing 0 to 15 cars, which can range from $15.50 to $165.50.

The range of a function represents the set of all possible output values or the values that the function can take.

In this case, the function is given by f(x) = 10.00x + 15.50, where x represents the number of cars washed.

To determine the range, we need to consider the possible values of x within the given context. Since Paul can wash up to 15 cars each day, the range of x is from 0 to 15, inclusive.

Now, let's calculate the corresponding values of f(x) for the range of x:

For x = 0:

f(0) = 10.00(0) + 15.50 = 15.50

For x = 1:

f(1) = 10.00(1) + 15.50 = 25.50

For x = 2:

f(2) = 10.00(2) + 15.50 = 35.50

.

.

For x = 15:

f(15) = 10.00(15) + 15.50 = 165.50

Therefore, the range of the function f(x) = 10.00x + 15.50, within the given context, is the set of all possible values of f(x) for x ranging from 0 to 15:

Range = {15.50, 25.50, 35.50, ..., 165.50}

In this case, the range consists of the values of Paul's total daily pay for washing 0 to 15 cars, which can range from $15.50 to $165.50.

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This code will print the Function value: g(-1) = 6 and g(t + 2) = 4t^2 - 7t + 13.

To find g(-1), we substitute t = -1 into the function g(t). This gives us g(-1) = 4(-1)^2 - 5(-1) + 7 = 6.

To find g(t + 2), we substitute t + 2 into the function g(t). This gives us g(t + 2) = 4(t + 2)^2 - 5(t + 2) + 7 = 4t^2 + 12t + 4 - 5t - 10 + 7 = 4t^2 - 7t + 13.

**The code to calculate the above:**

```python

def g(t):

 return 4 * t ** 2 - 5 * t + 7

print(g(-1))

print(g(2))

```

This code will print the values of g(-1) and g(2).

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The simplified expression is (-x² + 3x + 2) / ((x² + 3x) * (x² - 1)). The restrictions on the variable are x ≠ -3 and x ≠ 1.

To simplify the given expression, we need to find a common denominator and combine the fractions. The expression is:

1 / (x² - 1) - 2 / (x² + 3x)

To find a common denominator, we multiply the numerator and denominator of the first fraction by (x² + 3x) and the numerator and denominator of the second fraction by (x² - 1):

[(1 * (x² + 3x)) / ((x² - 1) * (x² + 3x))] - [(2 * (x² - 1)) / ((x² + 3x) * (x² - 1))]

Expanding the numerators:

[(x² + 3x) / ((x² - 1) * (x² + 3x))] - [(2x² - 2) / ((x² + 3x) * (x² - 1))]

Now, we can combine the fractions:

[(x² + 3x - (2x² - 2)) / ((x² + 3x) * (x² - 1))]

Simplifying the numerator:

[x² + 3x - 2x² + 2] / ((x² + 3x) * (x² - 1))

Combining like terms:

[-x² + 3x + 2] / ((x² + 3x) * (x² - 1))

The simplified expression is (-x² + 3x + 2) / ((x² + 3x) * (x² - 1)).

Restrictions on the variable: We need to exclude any values of x that would make the denominators zero. In this case, x cannot be equal to -3 or 1, as these values would result in division by zero.

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Exercise caution when making predictions beyond the observed range of data, and consider factors such as data quality, model assumptions, and potential limitations.

To perform quadratic extrapolation of a time series, you can use a quadratic model to estimate or predict the value of z at a future time t+1. Here's how you can do it:

Collect your time series data up to time t and note down the corresponding values of z.

Fit a quadratic model to the available data points. The quadratic model has the form: z = at^2 + bt + c, where a, b, and c are coefficients that need to be determined.

Use regression techniques such as least squares regression to estimate the coefficients a, b, and c of the quadratic model using the available data.

Once you have the estimated coefficients, substitute the value t+1 into the quadratic model equation to predict the value of z at time t+1.

For example, if your quadratic model is z = 2t^2 + 3t + 1, and you want to predict the value of z at time t+1, you would substitute the value (t+1) into the equation:

z(t+1) = 2*(t+1)^2 + 3*(t+1) + 1

After evaluating this equation, you will obtain the predicted value of z at time t+1 based on the quadratic extrapolation of the time series.

It's worth noting that extrapolation carries some inherent uncertainty and assumes that the underlying patterns in the time series will continue in the future. Therefore, exercise caution when making predictions beyond the observed range of data, and consider factors such as data quality, model assumptions, and potential limitations.

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Answer:

In any polygon, the sum of the measures of the exterior angles is 360°. In a hexagon, the sum of the measures of the interior angles is 720°.

The correct answer is C.

The limit of √3n⁴+5n−n² as n approaches infinity is 3. This means that the overall limit of the expression is equal to the square root of 3, which is 3.

We can factor the expression √3n⁴+5n−n² as follows:

√3n⁴+5n−n² = √(3n⁴+9n²−4n²+5n) = √(3n²(n²+3)−2n(n²+3)) = √(3n²−2n)(n²+3) = √(n²−1)(n²+3)

As n approaches infinity, the terms n²−1 and n²+3 both approach infinity. However, the term n²−1 approaches infinity much more slowly than the term n²+3. This means that the overall limit of the expression is equal to the square root of 3, which is 3.

In other words, as n gets larger and larger, the expression √3n⁴+5n−n² gets closer and closer to 3. This is because the terms n²−1 and n²+3 become more and more dominant, and the square root of 3 is the only value that can make the expression equal to itself.

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Solution for the given system of equations is x = 1/(y - 6). To explain further, let's examine each equation one by one.

In equation (F), y is in the denominator of the fraction, so we cannot solve for x directly. Similarly, in equation (H), x is in the denominator, making it difficult to find an explicit solution. In equation (G), we have x = 1/(y² - 6), which is a possible solution. However, in equation (I), we have x = 1/(y² + 6), which is not consistent with equation (G) and cannot be a valid solution. Finally, in equation (E), x = 1/(y - 6), we have a clear expression for x in terms of y. This equation provides a solution that is valid for the entire system. By substituting this expression for x in any of the other equations, we can see that it satisfies the given system of equations. Therefore, x = 1/(y - 6) is the main solution for the system.

In summary, the main solution for the given system of equations is x = 1/(y - 6). This expression provides a consistent solution that satisfies all the equations. By substituting this expression for x in any of the equations, we can verify its validity. It is important to carefully analyze each equation to identify the appropriate solution, taking into account the relationship between the variables and the constraints imposed by the equations.

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a) There are 32432400 different layouts possible when 7 chips of different types are placed on the board.

b) There are 6435 different layouts possible when 7 chips of the same type are placed on the board.

c) There are 48385814400 different layouts possible when all of the locations are filled with chips, with 3 of one type, 5 of another type, and all others different.

(a) If 7 chips of different types are to be placed on the board, the number of different layouts can be calculated using permutations.

Since each chip is placed in a different location, the order of placement matters.

The number of different layouts can be calculated using the formula for permutations:

P(n, r) = n! / (n - r)!

Where n is the total number of locations (15) and r is the number of chips (7).

P(15, 7) = 15! / (15 - 7)!

= 15! / 8!

= (15 × 14 × 13 × 12 × 11 × 10 × 9) / (7 × 6 × 5 × 4 × 3×2 × 1)

= 32432400

(b) If 7 chips of the same type are to be placed on the board, the order of placement does not matter.

The number of different layouts can be calculated using combinations.

The number of different layouts can be calculated using the formula for combinations:

C(n, r) = n! / (r!×(n - r)!)

Where n is the total number of locations (15) and r is the number of chips (7).

C(15, 7) = 15! / (7! × (15 - 7)!)

= 15! / (7!× 8!)

= (15 × 14× 13 × 12 × 11 × 10×9) / (7 ×6 ×5 × 4× 3 × 2 × 1)

= 6435

(c) The number of different layouts can be calculated using the formula for permutations:

P(n, r₁) × P(n - r₁, r₂) × P(n - r₁- r₂, r₃)

Where n is the total number of locations (15), r₁ is the number of locations for the first type of chip (3), r₂ is the number of locations for the second type of chip (5), and r₃ is the remaining number of locations for the other chips (7 - r₁ - r₂).

P(15, 3) × P(15 - 3, 5) × P(15 - 3 - 5, 7 - 3 - 5)

P(15, 3) × P(12, 5) × P(7, 1)

72730×95040×7

48385814400

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In the layout of a printed circuit board for an electronic product, 15 different locations can accommodate chips.

(a) If 7 chips of different types are to be placed on the board, how many different layouts are possible?

(b) If 7 chips of the same type are to be placed on the board, how many different layouts are possible?

(c) If all of the locations are to be filled with chips, 3 of which are of one type, 5 of which are another type, and all others different, how many different layouts are possible?

The required parameter of rectangle =  617,160 units.

Given that,

The width of the rectangular box = 555 units

To find the perimeter of the rectangular sandbox,

Calculate the sum of all its sides.

Determine the length by multiplying it by 555,as mentioned in the problem.

Hence, the length would be 555x555 = 308,025 units.

Since a rectangle has two pairs of equal sides,

Multiply the sum of the length and width by 2.

Thus, the perimeter would be 2 (555 + 308,025) = 617,160 units.

Hence,

The perimeter of the sandbox is 617,160 units.

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The factored form of equation 9x²- 4 is (3x + 2)(3x - 2).

Given Equation:

9x²- 4 = 0

We know that,

(a² + b²) = (a + b)(a - b)

9x²- 4 = (3x)² - (2)² =  (3x + 2)(3x - 2)

To determine the factor of this equation.

(3x + 2)(3x - 2) = 0

(3x + 2) = 0

x = -2/3

(3x - 2) = 0

x = 2/3.

Therefore, (3x + 2)(3x - 2) are the factored form of 9 x²- 4.

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Rounding to the nearest inch, the tip of the pendulum travels approximately 42 inches in one swing.

To calculate the distance traveled by the tip of the pendulum in one swing, we can use the arc length formula for a circle sector. The formula for arc length is given by:

Arc Length = radius * angle

In this case, the radius of the pendulum is 18 inches, and the angle it travels through is 3π/4 radians. Let's calculate the arc length:

Arc Length = 18 * (3π/4) = 13.5π

To round the answer to the nearest inch, we need to convert the value from π to a decimal approximation:

π ≈ 3.14159

Arc Length ≈ 13.5 * 3.14159 ≈ 42.41175

Rounding to the nearest inch, the tip of the pendulum travels approximately 42 inches in one swing.

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The missing term in the statement is "BC."

In the given scenario, we have points A, B, C, and D that are collinear, with B between A and C and C between B and D. To complete the statement "AB + _____ = AD," we need to determine the missing term.

Since points A, B, C, and D are collinear, the distance from A to D can be calculated by considering the distances from A to B and from B to D. By the Segment Addition Postulate, the sum of the lengths of AB and BC will give us the length of AD:

AB + BC = AD

Therefore, the missing term in the statement is "BC."

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Answer:

10.67 degree.

Step-by-step explanation:

Note:
The angle between two lines can be found using their direction cosines. The formula is:

[tex]\boxed{\tt cos\: \theta = \frac{a * b}{||a|| * ||b||}}[/tex]

where:

In this case, the direction cosines of the two lines are proportional to 1, 2, 3 and 3, 4, 5.

So, we can write the direction cosines as follows:

a = (1, 2, 3)

b = (3, 4, 5)

The magnitudes of a and b are:

[tex]\tt ||a|| = \sqrt{1^2 + 2^2 + 3^2} = \sqrt{13}[/tex]

[tex]\tt ||b|| = \sqrt{3^2 + 4^2 + 5^2}= 5\sqrt{2}[/tex]

Now, we can find the angle between the two lines using the formula above:

[tex]\tt cos \: \theta = \frac{1 * 3 + 2 * 4 + 3 * 5}{\sqrt{13} * 5\sqrt{2} }=\frac{13\sqrt{7}}{35}[/tex]

The angle theta can be found using the arc cos function or inverse cos function.

[tex]\tt \theta =cos^{-1}(\frac{13\sqrt{7}}{35})=10.67[/tex]

Therefore, the angle between the two lines is 10.67 degree.

The probability of making only 1 out of 3 free throws, given a 90% success rate, can be calculated using the Binomial Theorem as approximately 24.3%.

The Binomial Theorem is used to calculate the probability of a specific outcome in a sequence of independent events, each with a fixed probability of success. In this case, we want to find the probability of making only 1 out of 3 free throws, with a success rate of 90%. The formula for calculating the probability using the Binomial Theorem is:
P(k) = (n choose k) * (p^k) * ((1-p)^(n-k))
Where n is the total number of trials, k is the desired number of successes, p is the probability of success, and (n choose k) represents the binomial coefficient.
Plugging in the values, we have:
P(1) = (3 choose 1) * (0.9^1) * ((1-0.9)^(3-1))
     = (3) * (0.9) * (0.1^2)
     ≈ 0.243
Therefore, the probability of making only 1 out of 3 free throws, given a 90% success rate, is approximately 24.3%.

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The best approximation to a solution of the given system of equations is x = -60.5.

The system of equations given as 4x=22y=0x y=11 is not valid because the second equation 4x=22y=0x has two equal signs, which is not allowed in mathematics. It's unclear what was intended to be written in this equation.

However, we can solve the system of equations that's given as:

4x + 22y = 0

y = 11

To solve for x, we can substitute the second equation into the first equation:

4x + 22(11) = 0

Simplifying, we get:

4x + 242 = 0

Subtracting 242 from both sides, we get:

4x = -242

Dividing both sides by 4, we get:

x = -60.5

Therefore, the best approximation to a solution of the given system of equations is x = -60.5.

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The cost described in the scenario is an example of a mixed cost.

A mixed cost consists of both fixed and variable components. In this case, the $10 per month base charge represents the fixed component of the cost. This charge remains constant regardless of the amount of electricity consumed. It covers the basic service and is not influenced by usage levels.

On the other hand, the additional charge of $0.08 per kilowatt-hour (kWh) of electricity used represents the variable component. This charge varies directly with the amount of electricity consumed. As more electricity is used, the variable cost increases proportionally.

By combining the fixed base charge and the variable charge per kWh, we get a mixed cost structure. The fixed component ensures a minimum cost for the service, while the variable component adds to the total cost based on actual usage. This combination of fixed and variable elements makes the cost a mixed cost.

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The real square roots of the number 0.0049 are ±0.07. both a positive and a negative value since squaring either value will produce the original number.

To find the real square roots of a number, we need to determine the values that, when squared, yield the given number.

For the number 0.0049, the square root can be calculated as follows:

√0.0049 = ±0.07

Both positive and negative values of 0.07, when squared, result in 0.0049. Hence, the real square roots of 0.0049 are ±0.07.

It is important to note that the square root of a positive number can have both a positive and a negative value since squaring either value will produce the original number.

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Answer:

A. 2m

Step-by-step explanation:

The volume of a rectangular well is given by the formula [tex]V = lwh[/tex] ([tex]V = l \times w \times h[/tex])

In this case, we know that the volume of water in the well is 80 m³, and the length and width of the well are 8 m and 5 m, respectively. We can use this information to set up an equation for the height of the well:

[tex]80 = 8 \times 5 \times h[/tex]

Simplifying this equation, we get:

[tex]80 = 40 \times h[/tex]

Dividing both sides by 40, we get:

[tex]h = 2[/tex]

Therefore, the height of the well is 2 meters. The answer is option (a).

________________________________________________________

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The probability of sample point s2 can be determined by subtracting the sum of probabilities of s1, s3, and s4 from 1.

Let's assume the sample points are denoted as s1, s2, s3, and s4. We are given the probabilities of s1, s3, and s4, which are p(s1) = 0.3, p(s3) = 0.4, and p(s4) = 0.1, respectively.

To find the probability of s2, we can use the fact that the sum of probabilities for all possible sample points must equal 1. Therefore, we subtract the sum of the probabilities of s1, s3, and s4 from 1:

1 - (p(s1) + p(s3) + p(s4)) = 1 - (0.3 + 0.4 + 0.1) = 1 - 0.8 = 0.2

Hence, the probability of s2, denoted as p(s2), is 0.2.

In summary, we found the probability of sample point s2 by subtracting the sum of probabilities of s1, s3, and s4 from 1, resulting in a probability of 0.2 for s2.

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The value of � is **142.85**.

We can solve this problem by setting up the following equation:

```

2.80� = � * (1 + x/100)

```

where � is the original quantity, x is the percentage increase, and 2.80 is the result of the increase.

We can solve for x by dividing both sides of the equation by � and subtracting 1 from both sides:

```

2.8 = 1 + x/100

x/100 = 1.8

x = 180

```

Therefore, the value of � is 142.85.

Here is an explanation of the steps involved in solving the problem:

1. We set up the equation by representing the expression 2.80� as the product of � and 1 + x/100, where x is the percentage increase.

2. We divide both sides of the equation by � and subtract 1 from both sides to isolate x.

3. We solve for x and find that it is equal to 180.

4. We substitute this value of x back into the original equation to find that � is equal to 142.85.

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