(sinθ+cosθ)
2
−(sinθ−cosθ)
2
=2sin2θ​

The statement which is true is (1) It is okay to use the median to estimate the mean since both are a measure of the center of a distribution.

While both the median and the mean provide information about the center of a distribution, they are not interchangeable. The median represents the middle value of a dataset, while the mean represents the average value. In some cases, the median may be a better estimate of the center, especially when dealing with skewed distributions or outliers.

The standard deviation and the interquartile range (IQR) are two different measures of variability. The standard deviation measures the dispersion of data around the mean, while the IQR measures the range between the first quartile (25th percentile) and the third quartile (75th percentile). They capture different aspects of the data's spread and are not interchangeable.

Point estimates based on a sample, such as the sample mean or proportion, are subject to sampling variability. These estimates may not perfectly match the true population parameter they aim to estimate. The difference between a point estimate and the true parameter is known as sampling error, and it can be substantial, especially for small sample sizes. It is important to acknowledge and consider this potential variability when interpreting point estimates.

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Answer:

The correct answer is 9%.

The correlation coefficient r is a measure of the linear relationship between two variables. It can range from -1 to 1. A value of 0 means that there is no linear relationship between the variables. A positive value of r means that the variables are positively correlated, i.e., as one variable increases, the other variable also increases. A negative value of r means that the variables are negatively correlated, i.e., as one variable increases, the other variable decreases.

The square of the correlation coefficient, r^2, is called the coefficient of determination. It is a measure of the percentage of variation in the dependent variable that is explained by the variation in the independent variable. In this case, r = 0.3, so r^2 = 0.09. This means that 9% of the variation in the dependent variable is explained by the variation in the independent variable.

The other answers are incorrect. 0.09% is too small, 3% is too large, and 30% is much too large.

Step-by-step explanation:

The sum of the lengths of the two parallel sides, a + b, is equal to 30 centimeters.

Let's denote the lengths of the two parallel sides of the trapezoid as a and b. The formula for the area of a trapezoid is given by:

Area = (1/2) * (a + b) * h

where h represents the height of the trapezoid.

We are given that the area is 120 square centimeters and the height is 8 centimeters. Substituting these values into the formula, we have:

120= 1/2*(a+b)*8  

Multiplying both sides of the equation by 2 and dividing by 8, we get:

240 = a + b

a+b = 120*2/8

= 30 cm

Therefore, the sum of the lengths of the two parallel sides, a + b, is equal to 30 centimeters.

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The approximate probability the 11 players on a team will have a mean height of less than 72 inches is 0.047.

probability was calculated, we need to use the central limit theorem. This theorem states that the sample mean of a large enough sample (in this case, n=11 is considered large enough) taken from a population with any distribution will follow a normal distribution with a mean equal to the population mean and a standard deviation equal to the population standard deviation divided by the square root of the sample size.

Using this theorem and the given information, we can calculate the standard error of the sample mean as follows:

Standard error = standard deviation / square root of sample size
= 3.75 / sqrt(11)
= 1.13

Next, we need to standardize the sample mean using the z-score formula:

z = (sample mean - population mean) / standard error
= (72 - 73) / 1.13
= -0.88

Finally, we can use a standard normal distribution table or calculator to find the probability that a z-score is less than -0.88, which is approximately 0.047.

the approximate probability the 11 players on a team will have a mean height of less than 72 inches is 0.047, calculated using the central limit theorem and the z-score formula.

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A correlation of .9 indicates that 81% of the variance between two variables has been explained.

Correlation measures the strength of the relationship between two variables. A perfect positive correlation is 1.0, indicating that the two variables move in the same direction together. A perfect negative correlation is -1.0, indicating that the two variables move in opposite directions. A correlation of 0 indicates no relationship between the two variables.

To determine the proportion of variance explained by a correlation, you need to square the correlation coefficient (in this case, 0.9). This is called the coefficient of determination (R^2). So, you calculate:

R^2 = (0.9)^2 = 0.81

Thus, a correlation of 0.9 explains 81% of the variance between the two variables.

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The sales boy has a sale of $142.9.

Given that the commission given to a sales boy is 5%, he earns $150, we need to find the sale he did for the month,

So,

Let the sale be x,

Therefore,

x + 5% of x = 150

x of 105% = 150

x × 1.05 = 150

x = 142.9

Hence the sales boy has a sale of $142.9.

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Volume of cylinder is, V = 99π km³

And, Volume of sphere is, V = 457.3π meter³

Given that;

8) In cylinder;

Diameter = 18 km

Height = 11 km

9) In sphere,

Diameter = 14 m

Since, We know that;

Volume of cylinder is,

V = πr²h

V = π × 18/2 × 11

V = π × 9 × 11

V = 99π km³

And, We know that;

Volume of sphere is,

V = 4/3πr³

Hence, WE get;

V = 4/3 × π × (14/2)³

V = 4/3 × π × 7³

V = 457.3π meter³

Thus, We get;

Volume of cylinder is, V = 99π km³

And, Volume of sphere is, V = 457.3π meter³

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[tex]\stackrel{ \textit{\LARGE sum of all exterior angles} }{(6x+24)+(6x+26)+(4x+10)+(3x-22)+(5x-14)~~ = ~~360} \\\\\\ 24x+24=360\implies 24x=336\implies x=\cfrac{336}{24}\implies x=14[/tex]

The factored expression of the expression 4x³ - 6x² + 8x is 2x(2x² - 3x + 2)

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

4x³ - 6x² + 8x

The above expression is a polynomial expression

So, we have the following

4x³ - 6x² + 8x

Factor out x in 4x³ - 6x² + 8x

This gives

4x³ - 6x² + 8x = x(4x² - 6x + 8)

Factor out 2 in 4x² - 6x + 8

This gives

4x³ - 6x² + 8x = 2x(2x² - 3x + 2)

Hence, the factored expression is 2x(2x² - 3x + 2)

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Figure D, two lines that are the same distance apart :)

Answer:

4(x+1)+5(5x-4)

=4x+4+25x-20

=29x-16

The component form of the vector that describes the drummer's movement is <4, -3>.

The component form of a vector is given by the difference between the coordinates of the endpoints.

The initial point is (1, 4) and the final point is (5, 1).

Thus, the horizontal component is the difference between the x-coordinates, which is 5 - 1 = 4,

and the vertical component is the difference between the y-coordinates, which is 1 - 4 = -3.

Therefore, the component form of the vector that describes the drummer's movement is <4, -3>.

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When the depth reaches 8 inches, the rate at which the grain level is rising is approximately (15 / (2 * sqrt(3))) ft/min.

To find the rate at which the grain level is rising when the depth reaches 8 inches, we can consider the volume of the grain in the trough and its rate of change with respect to time.

The trough is in the shape of an equilateral triangle, so the cross-sectional area of the trough at any depth can be calculated using the formula: A = (sqrt(3)/4) * s^2, where s is the length of the side of the equilateral triangle.

In this case, the length of the side of the equilateral triangle is 2 feet, so the cross-sectional area of the trough is A = (sqrt(3)/4) * 2^2 = sqrt(3) square feet.

Given that the trough is 8 feet long, the volume V of the grain in the trough at any depth h can be calculated as V = A * h.

Now, let's differentiate both sides of the equation with respect to time t to find the rate at which the volume is changing: dV/dt = d(Ah)/dt.

Since the length of the trough remains constant, dh/dt represents the rate at which the depth is changing.

Therefore, dV/dt = A * (dh/dt).

We are given that the grain is poured into the trough at a rate of 5 cubic feet per minute, so dV/dt = 5 ft^3/min.

At the depth of 8 inches (or 8/12 = 2/3 feet), we want to find the rate at which the grain level is rising, which is dh/dt.

Plugging in the known values, we have: 5 = (sqrt(3) * h) * (dh/dt).

Simplifying the equation, we find: dh/dt = 5 / (sqrt(3) * h).

Substituting h = 2/3 (depth in feet), we can calculate the rate at which the grain level is rising.

dh/dt = 5 / (sqrt(3) * (2/3)) = 5 / (sqrt(3) * 2/3) = 5 / (2 * sqrt(3) / 3) = 5 * 3 / (2 * sqrt(3)) = (15 / (2 * sqrt(3))) ft/min.

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Answer: 50°

Step-by-step explanation:

7 and 6 are vertical angles, which means they are equal. m<7 and m<6 are 130 degrees. Then. m<4 and m<6 are supplementary angles, and if m<6 is 130°, then you subtract that from 180 to get 50 = m<4. m<4 and m<1 are vertical angles, so that means m<1 is 50°.

The area of the metal base for the water heater is approximately 452.2 square inches (rounded to the nearest tenth).

The radius of the hot water heater is 10 inches (half of the diameter). To find the radius of the base, we add the 2-inch overhang to the radius of the heater: 10 + 2 = 12 inches.

Now we can calculate the area of the base using the formula for the area of a circle: A = πr²

A = π(12)²  = 452.4 square inches (rounded to the nearest tenth).

Therefore, the area of the metal base for the hot water heater is 452.4 square inches.



To find the area of the metal base for the hot water heater, we need to calculate the area of a circle with a radius of 12 inches.

We get this radius by adding the 2-inch overhang to the radius of the heater, which is 10 inches. Using the formula for the area of a circle, A = πr² , we can plug in our value for r and solve for A.

After rounding to the nearest tenth, we get an area of 452.4 square inches. Therefore, the metal base needs to have an area of at least 452.4 square inches to properly support the hot water heater.


The area of the metal base for the hot water heater is 452.4 square inches, which was found by calculating the area of a circle with a radius of 12 inches (10 inch radius of the heater + 2 inch overhang). This information can be used to ensure that the base is the correct size and can properly support the hot water heater.

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The measure of angles m∠QTR and m∠PTQ are 98.25° and 81.75° respectively, using the angle N between intersecting tangents.

The angle between two tangent lines which intersect at a point is 180 degrees minus the measure of the arc between the two points of tangency.

61.5 = 180 - arc PS

arc PS = 180 - 61.5

arc PS = 118.5

m∠QTR = 1/2 × (118.5 + 78) {intersecting chords}

m∠QTR = 196.5/2

m∠QTR = 98.25

m∠PTQ = [360 - 2(98.25)]/2 {one of the angles at a point}

m∠PTQ = 163.5/2

m∠PTQ = 81.75

Therefore, measure of angles m∠QTR and m∠PTQ are 98.25° and 81.75° respectively, using the angle N between intersecting tangents.

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Disjoint events are events that cannot happen at the same time. Two events A and B are independent if the occurrence of A does not affect the probability of B happening, and vice versa. Mathematically, this can be written as P(A and B) = P(A)P(B).

In the case of disjoint events, P(A and B) = 0 because they cannot occur at the same time. Therefore, the condition for A and B to be independent is that either P(A) = 0 or P(B) = 0, since any non-zero probability for either event would make the product P(A)P(B) also non-zero.

Two disjoint events are independent if and only if at least one of them has zero probability.

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The input - output pairs of the linear function are given as follows:

The slope-intercept representation of a linear function is given by the equation shown as follows:

y = mx + b

The coefficients m and b have the meaning presented as follows:

From the table, when x increases by 8, y increases by 16, hence the slope m is given as follows:

m = 16/8

m = 2.

Hence:

y = 2x + b.

When x = 7, y = 16, hence the intercept b is given as follows:

16 = 14 + b

b = 2.

Hence the function is:

y = 2x + 2.

The output for an input of 25 is given as follows:

y = 2 x 25 + 2

y = 52.

The input for an output of 22 is given as follows:

22 = 2x + 2

2x = 20

x = 10.

The output for an input of 2x is given as follows:

y = 2(2x) + 2

y = 4x + 2.

The output for an input of x + 3 is given as follows:

y = 2(x + 3) + 2

y = 2x + 8.

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Brian orders 1000 t-shirts, and demand is 850, resulting in a $2200 profit after expenses and revenue.

To calculate the payoff for Brian if he orders 1000 t-shirts and the demand is 850, we need to consider the costs and revenues involved.

Costs:

Brian purchases each t-shirt for $6, so the cost of ordering 1000 t-shirts is 1000 * $6 = $6000.

Additionally, Brian incurs a service fee of $300.

Revenues:

Brian plans to sell each t-shirt for $10.

If the demand is 850, he will be able to sell 850 t-shirts.

Revenue from t-shirt sales:

Revenue = Selling price per t-shirt * Number of t-shirts sold

Revenue = $10 * 850 = $8500

Payoff:

The payoff is calculated by subtracting the costs from the revenues.

Payoff = Revenue - Costs

Payoff = $8500 - ($6000 + $300)

Payoff = $8500 - $6300

Payoff = $2200

Therefore, if Brian orders 1000 t-shirts and the demand is 850, his payoff would be $2200. This represents the profit he would make after accounting for the costs of purchasing the t-shirts and the service fee, and the revenue generated from selling the t-shirts.

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The key feature that f(x) and g(x) have in common is that they both have a y-intercept of (0, 5). They differ in terms of their domain, range, and x-intercepts.

The function f(x) = -4^x + 5 is an exponential function, while g(x) = x^3 + x^2 - 4x + 5 is a polynomial function of degree 3.

To show that f(x) is an exponential function, we can observe that it has the form f(x) = a*b^x + c, where a = 5, b = -4, and c = 0. This function has a domain of all real numbers and a range of (0, 5). The x-intercept is not defined since the base of the exponential function is negative, and the y-intercept is (0, 1).

On the other hand, g(x) is a polynomial function of degree 3, which means that it has the form g(x) = ax^3 + bx^2 + cx + d. This function has a domain of all real numbers and a range of (-∞, ∞). The x-intercepts can be found by setting g(x) equal to zero and solving for x, while the y-intercept is (0, 5).

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To calculate Mrs Jendor's profit, we first need to determine the cost price of the radio set.

Let's assume that the cost price of the radio set is "x".

We know that Mrs Jendor made a profit of 10% on the cost price. This means that the selling price is 110% of the cost price.

We can write this as:

Selling price = Cost price + Profit

29,700 = x + 0.1x

Simplifying this equation, we get:

1.1x = 29,700

x = 27,000

So, the cost price of the radio set is 27,000.

Now, we can calculate the profit made by Mrs Jendor:

Profit = Selling price - Cost price

Profit = 29,700 - 27,000

Profit = 2,700

Therefore, Mrs Jendor made a profit of 2,700 on the sale of the radio set.

Therefore, the control represented by the decimal value 15 is the one with all four bits set to 1.

In digital electronics, binary digits (bits) are used to represent numbers and control various devices. Each bit can have a value of either 0 or 1, and by combining multiple bits, we can represent larger numbers or control signals. The decimal system, which we are most familiar with, uses 10 digits (0-9) to represent numbers. In contrast, the binary system uses only 2 digits (0 and 1) to represent numbers or controls. To convert a decimal number to binary, we repeatedly divide the number by 2 and keep track of the remainders. The binary representation of a number is the sequence of remainders read in reverse order.

The decimal value 15 can be represented as a control with four binary digits (bits), as follows:

1 1 1 1

Each bit represents a power of 2, from right to left: 2^0, 2^1, 2^2, 2^3. Adding up the powers of 2 where there is a 1 in the binary representation gives us the decimal value.

So, in this case, we have:

1x2^0 + 1x2^1 + 1x2^2 + 1x2^3 = 1 + 2 + 4 + 8 = 15

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A linear programming problem with two decision variables can be solved by a graphical solution method. In this method, the constraints and the objective function of the linear programming problem are graphed on a two-dimensional coordinate plane, and the optimal solution is found at the intersection of the feasible region (the area defined by the constraints) and the level curve of the objective function.

The graphical solution method is a simple and intuitive way to solve linear programming problems with few decision variables, but it becomes impractical as the number of decision variables and constraints increase. In such cases, more complex algorithms, such as the simplex method or interior point methods, are used to find the optimal solution.

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The dimensions of the largest rectangle that can be formed if all the sides (including the partition) sum to 600 units are 150 units x 150 units. This solution yields an area of 22,500 square units.

To find the dimensions of the largest rectangle that can be formed if all the sides (including the partition) sum to 600 units, we can use the concept of optimization. Let's assume that the rectangle has a length of L and a width of W, with a partition dividing it into two smaller rectangles.
Since all the sides (including the partition) sum to 600 units, we can express this mathematically as:
L + W + 2x = 600
where x represents the length of the partition. Rearranging the equation, we get:
L + W = 600 - 2x
The area of a rectangle is given by the formula A = L x W. To find the largest possible area of the rectangle, we need to maximize this function.
Substituting the above equation into the area formula, we get:
A = (600 - 2x - W) x W
Expanding and simplifying, we get:
A = 600W - 2W^2 - Wx
To find the maximum value of A, we can differentiate it with respect to W and set it equal to zero:
dA/dW = 600 - 4W - x = 0
Solving for W, we get:
W = (600 - x)/4
Substituting this value of W back into the equation for A, we get:
A = (600 - x)^2/16
To maximize A, we need to minimize x. Since x represents the length of the partition, this means that the partition should be as small as possible. Therefore, the largest rectangle that can be formed will be a square with sides of 150 units, and the partition will have a length of zero.
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The x-intercept for the given equation is x = -3.

Given is an equation 2x-y = -6, we need to find the x-intercept for the line,

So the x-intercept of a line is the point where it cuts the x-axis,

To find the x-intercept we will put y = 0,

So,

2x - 0 = -6

2x = -6

x = -3

Or, you can just see the points from which it is passing the x-values will be the x-intercept,

Hence the x-intercept of the line is x = -3.

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a is correct

Step-by-step explanation: