Marquis and Yolanda plan to sell T-shirts at their school’s Community Day. They make 25 shirts and each costs $15 to make. If they would like to make $320 in profit, how much should they sell each T-shirt for?

The variance of the sample of data is 3.33.

To calculate the variance of a sample of data, we first need to find the mean of the data. The mean is the average of all the data points.

To find the mean, we add up all the data points and divide by the number of data points:

(7 + 5 + 8 + 4 + 6 + 3 + 9 + 7 + 6 + 5) / 10 = 60 / 10 = 6

Next, we need to find the difference between each data point and the mean, and square each difference:
(7 - 6)^2 = 1
(5 - 6)^2 = 1
(8 - 6)^2 = 4
(4 - 6)^2 = 4
(6 - 6)^2 = 0
(3 - 6)^2 = 9
(9 - 6)^2 = 9
(7 - 6)^2 = 1
(6 - 6)^2 = 0
(5 - 6)^2 = 1

Next, we add up all the squared differences:

1 + 1 + 4 + 4 + 0 + 9 + 9 + 1 + 0 + 1 = 30

Finally, we divide the sum of the squared differences by the number of data points minus 1:

30 / (10 - 1) = 30 / 9 = 3.33

Therefore, the variance of the sample of data is 3.33.

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(\begin{bmatrix}\frac{1}{5} & -\frac{2}{5} \\-\frac{3}{5} & \frac{7}{5}\end{bmatrix}\)

To find the inverse of the given matrix 3. \( \left[\begin{array}{ll}7 & 2 \\ 3 & 1 \\ 2 & 3 \\ \text { 4. }

5 .\end{array}\right] \), use the following steps:

1. Find the determinant of the matrix by using the formula det \(A = ad-bc\). The determinant of the given matrix is \((7*1) - (2*3) = 5\).

2. Find the adjoint of the matrix by using the formula

\(A^T = \begin{bmatrix}
a & b \\c & d\end{bmatrix}^T = \begin{bmatrix}d & -b \\-c & a\end{bmatrix}\)

The adjoint of the given matrix is \\begin{bmatrix}1 & -2 \\-3 & 7\end{bmatrix}\)

3. Find the inverse of the matrix by using the formula \(A^{-1} = \frac{1}{det(A)} \cdot A^T\).

The inverse of the given matrix is \(\begin{bmatrix}\frac{1}{5} & -\frac{2}{5} \\-\frac{3}{5} & \frac{7}{5}\end{bmatrix}\)

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i. From the data in COUNTYMURDERS, 1996, there were 0 counties with zero murders.

ii. From the data in COUNTYMURDERS, 1996, there were 18 counties with at least one execution. The largest number of executions was 4.

iii. The estimated equation for murders is Bo + B₁execs + u = 2.5 + 0.6execs + u. The sample size is 18 and the R-squared is 0.64.

iv. The slope coefficient of 0.6 suggests that for every additional execution, there is an increase of 0.6 murders. This does not suggest a deterrent effect of capital punishment.

v. The smallest number of murders that can be predicted by the equation is 2.5, when there are zero executions. The residual for a county with zero executions and zero murders is -2.5.

vi. A simple regression analysis is not well suited for determining whether capital punishment has a deterrent effect on murders because it does not take into account other factors that may influence the number of murders, such as socioeconomic status, education levels, and crime rates. A more complex regression model that includes these factors would provide a more accurate estimate of the relationship between capital punishment and murders.

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The work done by the force on the object is W∈ = -2.20 x 104 Nm.

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Alice therefore requires 72 feet of netting.

An example of a quadrilateral with equal and aligned opposing edges is a rectangular. It is a rectangle with four sides and four edges that are each 90 degrees. A rectangular is a form with only two dimensions.

If the longer dimension of the rectangle is 25 feet, then we can write:

x + 14 = 25

Solving for x, we get:

x = 25 - 14 = 11

Therefore, the height of the rectangle is 11 feet.

To find the total amount of fencing Alice needs, we need to add up the length of all four sides of the rectangle. Since opposite sides of a rectangle are equal in length, we can write:

Total fencing = 2(length + height)

Substituting the values of length and height, we get:

Total fencing = 2(25 + 11)

Total fencing = 72 feet

Therefore, Alice needs 72 feet of fencing.

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Answer:

k = .5 inches

Step-by-step explanation:

The probability that fewer than 3 of the selected consumers believe that cash will be obsolete in the next 20 years is 0.478

This probability problem can be solved using the binomial distribution. In this case, the probability of success is 0.40 (since 40% of consumers believe that cash will be obsolete), and the number of trials is 7 (since we are selecting 7 consumers).

To find the probability that fewer than 3 of the selected consumers believe that cash will be obsolete, we need to find the probability of getting 0, 1, or 2 successes. We can use the binomial probability formula to calculate each of these probabilities and then add them together:

P(X < 3) = P(X = 0) + P(X = 1) + P(X = 2)

Where X is the number of consumers who believe that cash will be obsolete, and P(X) is the probability of getting X successes.

The probability of getting exactly X successes in a binomial distribution with probability of success p and number of trials n is given by the formula:

P(X) = (n CX) * p^X * (1 - p)^(n - X)

Where (nCX) represents the number of ways to choose X successes from n trials, and is calculated using the binomial coefficient formula:

(nCX) = n! / (X! * (n - X)!)

Where n! represents the factorial of n, which is the product of all positive integers up to and including n.

Using this formula, we can calculate the probabilities of getting 0, 1, and 2 successes as follows:

P(X = 0) = (7C0) * 0.40^0 * 0.60^7 = 0.028

P(X = 1) = (7C1) * 0.40^1 * 0.60^6 = 0.15

P(X = 2) = (7C2) * 0.40^2 * 0.60^5 = 0.30

Thus, the probability of getting fewer than 3 successes is:

P(X < 3) = P(X = 0) + P(X = 1) + P(X = 2) = 0.028 + 0.15 + 0.30 = 0.478

Hence, the probability is 0.478.

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The number of bacteria produced is a function of time in hours.

In Mathematics, a function simply refers to a mathematical expression which can be used for defining and showing the relationship that exist between two or more variables in a data set.

This ultimately implies that, a function typically shows the relationship between input values (x-values or domain) and output values (y-values or range) of a data set, as well as showing how the elements in a table are uniquely paired (mapped).

Based on the information provided above, we can reasonably infer and logically deduce that the bacteria's population increases with respect to time (number of hours).

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The balance in your account after 10 years will be $2,473.08.

To find the balance in your account after 10 years with an initial deposit of $1,500 and an annual interest rate of 5% compounded continuously, you can use the formula A = Pe^(rt), where A is the final balance, P is the initial deposit, r is the annual interest rate, and t is the number of years.

In this case, P = $1,500, r = 5%, and t = 10. Plugging these values into the formula, we get:

A = $1,500 * e^(0.05 * 10)
A = $1,500 * e^(0.5)
A = $1,500 * 1.64872
A = $2,473.08

the balance in your account after 10 years will be $2,473.08.

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Fοr the given expοnential functiοn, neither Andre nοr Elena gave the cοrrect explanatiοn οr calculatiοn. They bοth are wrοng.

The expοnent οf a number indicates hοw many times a number has been multiplied by itself. Expοnents are necessary since, withοut them, it is highly challenging tο express the prοduct when a number is repeated several times by itself. A fractiοnal expοnent is οne where the expοnent οf a number is a fractiοn. Hοw many times we must multiply the reciprοcal οf the base is indicated by a negative expοnent. A number's expοnent is referred tο as a decimal expοnent if it is expressed in decimal fοrm. Any decimal expοnent's prοper respοnse can be a little tricky tο evaluate, thus in these situatiοns, we discοver the apprοximate sοlutiοn.

The cοmplete questiοn is given belοw.

The number οf cοins they get after 28 days = 2²⁸

This is given in expοnents fοrm.

This means that 2 is multiplied by itself 28 times.

Sο if we expand this expοnent, it will becοme:

2²⁸ = 2 * 2 * 2* 2 * 2*...........................................* 2 (until the cοunt οf 2 becοmes 28)

Andre wrοte:

2²⁸ = 2 * 28

This is wrοng because this is just twice οf 28.

Elena said, "Expοnents means repeated multiplicatiοn, which means 28*28."

This is alsο wrοng because in the οriginal expressiοn, it is given 2²⁸ which is expanded as abοve.

Here the base is 2 and the expοnent is 28.

But Elena tοοk base as 28 and expοnent as 2.

Sο it becοmes 28² = 28 *28

Therefοre fοr the given expοnential functiοn, neither Andre nοr Elena gave the cοrrect explanatiοn οr calculatiοn. They bοth are wrοng.

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The area of the shaded region under the standard normal curve is 0.4783.

One kind of the normal distribution is the standard normal distribution. It happens when a typical random variable's mean and standard deviation are both one. In other terms, the term "standard normal distribution" refers to a normal distribution with a mean of 0 and a standard deviation of 1. Moreover, the conventional normal distribution has a centre point of zero, and the standard deviation indicates how much a measurement deviates from the mean.

The area under the standard normal curve can be determined using the z-table for area.

For the given figure the area under the standard normal curve is given as:

P[-2.02<Z<0]

=0.5-0.0217

=0.4783

Hence, the area of the shaded region under the standard normal curve is 0.4783.

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The complete question is:

If Jose has done 100 more science experiments than Gabby and the number of science experiments done by Gabby is x, an expression representing Jose's experiments is 100 + x.

Mathematically, an expression is the combination of variables, constants, values, and numbers using mathematical operands but without an equal symbol (=).

The basic mathematical operands include addition (+), subtraction (-), division (÷), and multiplication (×).

Let the number of science experiments performed by Gabby = x

The number of science experiments performed by Jose = x + 100

x + 100

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Step-by-step explanation:

these 2 parallel lines create similar triangles.

that mags they're is one common scaling factor for the side lengths bergen the 2 triangles.

and that means they must have the same ratio.

the large triangle has the side lengths

24 + 9 = 33

32 + x

the smaller triangle has the corresponding side lengths

24

32

so, the equal ratios are

24/33 = 32/(32+x)

24(32 + x) = 32×33

32 + x = 32×33/24 = 4×11 = 44

x = 44 - 32 = 12

To solve the equation, we need to get rid of the fractions by multiplying both sides of the equation by the least common denominator (LCD), which is (b^(2)-9). This will give us:
(8)(b^(2)-9)/(b^(2)-9)-(1)(b^(2)-9)/(b+3)=(1)(b^(2)-9)/(b^(2)-9)
Simplifying the equation gives us:
8-(b^(2)-9)/(b+3)=1
Next, we will isolate the variable term by subtracting 8 from both sides of the equation:
-(b^(2)-9)/(b+3)=-7
Now, we will multiply both sides of the equation by (b+3) to get rid of the fraction:
-(b^(2)-9)=-7(b+3)
Expanding the equation gives us:
-b^(2)+9=-7b-21
Rearranging the equation gives us:
b^(2)-7b-30=0
Factoring the equation gives us:
(b-10)(b+3)=0
Setting each factor equal to zero gives us the possible solutions:
b-10=0 or b+3=0
Solving for b gives us the possible solutions:
b=10 or b=-3
However, we need to check for extraneous solutions by plugging the possible solutions back into the original equation. Plugging in b=10 gives us a true statement, but plugging in b=-3 gives us an undefined expression. Therefore, the only solution is b=10.
Answer: b=10

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The points are not on the same side. And the distance between the line from (3, -1) and (2, 4) will be 1 / √5 units and 6 / √5 units, respectively.

Let (x₁, y₁) be the point and ax + by + c = 0 be the line. Then the distance between a point and a line will be given as,

[tex]\rm d = \dfrac{|ax_1 + by_1 + c|}{\sqrt{a^2 + b^2}}[/tex]

The diagram is given below.

The points are not on the same side of the line y = 2x - 6. Then the distance from a line to (3, -1) is given as,

d = |2 × 3 - (-1) - 6| / [√(2² + (-1)²)]

d = |7 - 6| / √5

d = 1 / √5

And the distance from a line to (2, 4) is given as,

d = |2 × 2 - 4 - 6| / [√(2² + (-1)²)]

d = |-6| / √5

d = 6 / √5

The points are not on the same side. And the distance between the line from (3, -1) and (2, 4) will be 1 / √5 units and 6 / √5 units, respectively.

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The resulting matrix is \( \left[\begin{array}{ll}0 & 0 \\ 0 & 0\end{array}\right] \).

we notice is that the resulting matrix is the zero matrix, which means that all of its elements are zero. This is because the matrices \( A \) and \( B \) are inverses of each other.

To calculate \( A B \), we multiply the elements in each row of \( A \) with the corresponding elements in each column of \( B \) and then add them together. This gives us the elements in the resulting matrix.

So, the first element in the resulting matrix is \( (4 * 1) + (2 * -2) = 4 - 4 = 0 \). The second element is \( (4 * -3) + (2 * 6) = -12 + 12 = 0 \). The third element is \( (2 * 1) + (1 * -2) = 2 - 2 = 0 \). And the fourth element is \( (2 * -3) + (1 * 6) = -6 + 6 = 0 \).

Therefore, the resulting matrix is \( \left[\begin{array}{ll}0 & 0 \\ 0 & 0\end{array}\right] \).

What we notice is that the resulting matrix is the zero matrix, which means that all of its elements are zero. This is because the matrices \( A \) and \( B \) are inverses of each other. When we multiply a matrix by its inverse, we get the identity matrix, which has ones on the main diagonal and zeros everywhere else. But in this case, since the matrices are 2x2, the identity matrix is just the zero matrix.

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The volume of the composite figure is 301 cm³

Volume is defined as the space occupied within the boundaries of an object in three-dimensional space. It is also known as the capacity of the object.

Given is shape of ice creme we need to find the shapes in it and the volume.

1) The figure is a composite figure of a hemisphere and a cone.

2) Volume of hemisphere = 2/3 π × radius³, here radius is 4 cm

Volume = 2/3 π × 4³

= 2/3 × 3.14 × 64

= 134 cm³

Volume of a cone  = 1/3 π × radius² × height, here height is 10 cm

Volume = 1/3 × 3.14 × 16 × 10

= 167 cm³

3) The volume of the composite figure is the sum of the volumes of the hemisphere and the cone.

= 134 + 167 = 301 cm³

Hence, the volume of the composite figure is 301 cm³

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When one holder has a height of 5 inches and a width of 4 inches, this is approximately have Surface Area of 1385.44  inches² if we round to two decimal places.

what is surface area ?

Surface area is a measurement of the overall space occupied by an object's surface. It is the total area of the object's faces, sides, and curved sections. The surface area of a cube, for instance, is equal to the total of the areas of each of its six square faces. Similar to a sphere, a cylinder's surface area is equal to the total of the areas of its two circular bases and its curved surface. Units of surface area include square inches (in²), square feet (ft²), and square metres (m²). It is a crucial measurement in a variety of industries, including science, engineering, and building.

given

We must first determine the cylinder's surface area in order to determine how much material will be required to create one cylindrical pencil case.

The following is the calculation for a cylinder's surface area:

S = 2πrh + 2πr²

S stands for surface area.

r is the cylinder's radius.

h is the cylinder's height.

The radius of the holder is equal to half of its 4 inch circumference, or 2 inches.

Consequently, the total area for one holder will be:

S = 2π(2)(5) + 2π(2)²

S = 20π

In order to create one pencil holder, Mrs. Howard would require 20 square inches of material.

She would require: to create pencil holders for each of her 22 pupils.

22 × 20 inches of material equals 440  inches².

When one holder has a height of 5 inches and a width of 4 inches, this is approximately 1385.44  inches² if we round to two decimal places.

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Answer:

the nearest degree is a in the given figure

The normalized orthogonal distance between the robot and the reference trajectory line is approximately 4.16.

The normalized orthogonal distance is the distance between the robot and the reference trajectory line. We can use the following formula to calculate the normalized orthogonal distance:

normalized orthogonal distance = |(y2 - y1)x0 - (x2 - x1)y0 + x2y1 - y2x1| / √((y2 - y1)^2 + (x2 - x1)^2)

Where (x0, y0) is the position of the robot, and (x1, y1) and (x2, y2) are the positions of the two points on the reference trajectory line.

Plugging in the values given in the question, we get:

normalized orthogonal distance = |(7 - 3)5 - (8 - 2)0 + 8*3 - 7*2| / √((7 - 3)^2 + (8 - 2)^2)

Simplifying the equation, we get:

normalized orthogonal distance = |20 - 0 + 24 - 14| / √(16 + 36)

normalized orthogonal distance = |30| / √(52)

normalized orthogonal distance = 30 / √(52)

normalized orthogonal distance ≈ 4.16

Therefore, the normalized orthogonal distance between the robot and the reference trajectory line is approximately 4.16.

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The constant of Proportionality, k helps to determine the values of one variable when other is specify. The value of x when y = 3 is equals to the 3/4 or 0.75.

Proportionality defined as ratio that exists between two quantities. Let us consider two variables, x and y, saying that y is directly proportional to x means that the ratio y/x is constant for all values for these quantities. The constant of proportionality is denoted by, k, and we can write the proportion equation for y is directly proportion to x, i.e., y = kx, --(1), where k is constant of proportionality

Also, y =24 when x= 6

To determine the value of k, substitute the known value, y = 24, x = 6

=> 24 = k×6

=> k = 24/6 = 4

so, equation (1) is y = 4x --(2)

To determine the value of x by substituting y = 3,

=> y = 4x

=> 3 = 4x

=> x = 3/4

Hence, required value of x is 3/4.

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Complete question :

If y is directly proportional with x and y= 24 when x =6. What is the value of x when y= 3?

The measure of angle x is 70°.

Here we have the image of some triangles, and we want to find the value of the interior angle x in the left triangle.

What you need to remember here is that the sum of the interior angles of any triangle is always equal to 180°.

Then, for the left triangle, we can write:

30° + 80° + x° = 180°

Now we can solve that equation for x, then we will get:

x° = 180° - 80° - 30°

x = 70°

That is the measure of angle x.

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Tthe range of the function \( y=\sec (\pi x-4 \pi)-3 \) is \((- \infty, -4] \cup [-2, \infty)\) in interval notation.

To determine the range of the function \( y=\sec (\pi x-4 \pi)-3 \), we need to find the values of \(y\) that the function can take.

First, let's consider the range of the function \(y=\sec(\theta)\). The secant function is the reciprocal of the cosine function, so the range of \(y=\sec(\theta)\) is the set of all real numbers except the values for which \(\cos(\theta)=0\). The cosine function is equal to zero at \(\theta=\frac{\pi}{2}+n\pi\), where \(n\) is an integer. Therefore, the range of \(y=\sec(\theta)\) is \((- \infty, -1] \cup [1, \infty)\).

Now, let's consider the transformation of the function. The function \( y=\sec (\pi x-4 \pi)-3 \) is a transformation of the function \(y=\sec(\theta)\) with a horizontal shift of \(4\) units to the right and a vertical shift of \(3\) units down. The horizontal shift does not affect the range of the function, but the vertical shift does. The range of the function \( y=\sec (\pi x-4 \pi)-3 \) is \((- \infty, -4] \cup [-2, \infty)\).

Therefore, the range of the function \( y=\sec (\pi x-4 \pi)-3 \) is \((- \infty, -4] \cup [-2, \infty)\) in interval notation.

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A Polyhedron with 10 edges and 6 vertices has 4 faces.  

A. Yes, all of the shapes satisfy Euler's Formula, which states that F + V - E = 2, where F is the number of faces, V is the number of vertices, and E is the number of edges. The following table shows that each shape satisfies this formula:

B. A polyhedron with 10 edges and 6 vertices has 4 faces. The polyhedron that satisfies these conditions is a regular tetrahedron.

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Step-by-step explanation:

If a point is on the y-axis, it means that its x-coordinate is 0. Therefore, x = 0. However, the value of y can be any real number, since the point can be at any height above or below the origin. Therefore, y ≠ 0. So the statement that must be true is x = 0.

To rearrange the equation y - 3 = 2x into slope-intercept form, we need to solve for y.

First, we can add 3 to both sides of the equation to isolate y:

y - 3 + 3 = 2x + 3

Simplifying the left side gives:

y = 2x + 3

Now, the equation is in slope-intercept form y = mx + b, where m is the slope (in this case, m = 2) and b is the y-intercept (in this case, b = 3).

Answer:

x = 9[tex]\sqrt{\frac{1}{2}}[/tex]

Step-by-step explanation:

the base angles are both 45°, so both legs of the isosceles triangle = x

9² = x² + x² = 2x²      Pythagorean theorem

x² = 9²/2

x = √(9²/2) = 9√(1/2)

Answer:

8) Area of triangle ABC is 60

   Area of triangle XYZ is 540

9) The ratio is 1:9

10) (use Pythagorean theorem)

     BC is 12 [tex]\sqrt{13^{2}-5^{2} } =12[/tex]

     YZ=39 (the legs are the same because it is an Isosceles triangle)

11) the ratio is 1:3

Step-by-step explanation:

The statement ''The Invertible Matrix Theorem states that if the columns of A span, then matrix A is invertible. Therefore, the columns are linearly independent'' is true, because because this statement correctly describes the named theorem.

According to the Invertible Matrix Theorem, if the columns of A span Rn, then matrix A is invertible. This also means that the columns of A are linearly independent. In other words, the columns of A form a basis for Rn, and no column can be expressed as a linear combination of the others. Therefore, the statement is true.

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