I just need q24. a) i dunno how to do it​

Answer: The correct answer is:

The equation ý = -7.61 +0.19x is called the least-squares regression line because it minimizes the sum of the squared residuals.

Explanation:

The least-squares regression line is a line that represents the best linear approximation of the relationship between two variables. It is called "least-squares" because it minimizes the sum of the squared residuals, which are the differences between the observed values and the predicted values from the regression line.

In this case, the scatterplot shows the relationship between arm span and foot length for 19 students in a statistics class. The equation ý = -7.61 +0.19x is the equation of the least-squares regression line for this data set. This means that it is the line that best fits the data by minimizing the sum of the squared residuals.

Therefore, the correct answer is that the equation ý = -7.61 +0.19x is called the least-squares regression line because it minimizes the sum of the squared residuals.

Step-by-step explanation:

The inverse relation of the function f(x)=−72x+4 is f⁻¹(x) = 4 - y / 72.

A function takes in values, applies specific operations to them, and produces an output. The inverse function acts, agrees with the outcome, and returns to the initial function. The graph of the inverse of a function shows the function and the inverse of the function, which are both plotted on the line y = x. This graph's line traverses the origin and has a slope value of 1.

The given function is:

f(x)=−72x+4

Substitute the value of f(x) = y:

y = -72x + 4

Isolate the value of x:

y - 4 = -72x

x = 4 - y / 72

Now, let the value of x be written as f⁻¹(x), thus:

f⁻¹(x) = 4 - y / 72

Hence, the inverse relation of the function f(x)=−72x+4 is f⁻¹(x) = 4 - y / 72.

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Answer:

The correct answer is

According to the given information, a significance level is of 0.05, the population standard deviation is the square root of the population variance is true, the critical z-score is 1.96, z-score is -1.64.

What is the mean and standard deviation?

The mean, also known as the average, is the sum of all the values in the data set divided by the number of values. The standard deviation measures the amount of variability or dispersion in the data set.

1) When we are only interested in one side of the curve, we use a one-tailed test with a significance level of 0.05. For a one-tailed test with a significance level of 0.05, the critical z-score is 1.645 for a right-tailed test and -1.645 for a left-tailed test.

2) The population standard deviation is the square root of the population variance: True. The population standard deviation is the square root of the population variance. The formula for population variance is:

[tex]$\sigma^2 = \frac{\sum_{i=1}^N (x_i - \mu)^2}{N}$[/tex]

where [tex]$\sigma^2$[/tex] is the population variance, [tex]$\mu$[/tex] is the population mean, [tex]$x_i$[/tex] are the individual values in the population, and [tex]$N$[/tex] is the size of the population. The formula for population standard deviation is:

[tex]$\sigma = \sqrt{\sigma^2}$[/tex]

3) When we are interested in both sides of the curve, we use a two-tailed test with a significance level of 0.05. For a two-tailed test with a significance level of 0.05, the critical z-score is 1.96.

4) To find the z-score for an IQ score in the lower 5%, we need to find the z-score that corresponds to a cumulative probability of 0.05. Using a standard normal distribution table, we find that the z-score for a cumulative probability of 0.05 is approximately -1.64. Therefore, an IQ score in the lower 5% corresponds to a z-score of approximately -1.64.

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The hypothesis that states that the mean difference between two groups is due to sampling error is the null hypothesis.

What is a hypothesis?

A hypothesis is a theory or idea that is proposed and tested to see if it can be proven to be true. It is used to explain a phenomenon and make predictions. A null hypothesis is a type of hypothesis that assumes that there is no significant difference between two groups or variables being studied. It is the default hypothesis that researchers assume to be true unless proven otherwise

If the null hypothesis is proven to be false, it means that there is a significant difference between the groups or variables being studied. In such a case, an alternative hypothesis is formulated.The hypothesis that states that the mean difference between two groups is due to sampling error is the null hypothesis. It assumes that the difference between the groups is due to chance or random sampling errors rather than a real effect. The null hypothesis is tested using statistical tests to see if the results are significant or not. If the results are not significant, it means that there is no evidence to reject the null hypothesis, and the difference between the groups is due to sampling error.

If the results are significant, it means that there is enough evidence to reject the null hypothesis, and the difference between the groups is real and not due to chance or sampling error. Therefore, the null hypothesis is an essential tool in hypothesis testing, and it helps researchers to determine whether the results are meaningful or not.

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The maximum number of intersection points between 5 circles on a plane is 20.

To see why, we can use a formula that calculates the maximum number of intersection points between n circles on a plane. This formula is:

N = n(n-1)/2

For n=5, we have:

N = 5(5-1)/2

N = 5(4)/2

N = 10

So there are a total of 10 intersection points between the 5 circles. However, we have to remember that not all of these intersection points may be distinct. For example, three circles intersecting at the same point will count as three intersections, but only as one distinct intersection point.

Therefore, we need to count how many of these 10 intersection points are distinct. With a bit of visualization, we can see that each circle can intersect with the other four circles in two different points, for a total of 8 distinct intersection points per circle. Since we have 5 circles, we multiply 8 by 5 to get:

8 x 5 = 40

However, we have overcounted, since any intersection point shared by three circles counts as three, but only as one distinct intersection point. There are exactly 10 such triple intersections, as we can see by drawing the five circles such that each circle intersects with the other two. So we need to subtract 20 (since each of the 10 triple intersections counts as 3, not 1).

Therefore, the maximum number of distinct intersection points between 5 circles on a plane is:

40 - 20 = 20

So the answer is 20.

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Step-by-step explanation:

a) Domain of both functions is all real numbers (-∞, +∞), as there are no restrictions on the input (x).

b) The range of A) f(x)=x² /3 is [0, +∞), as the minimum value of the function is 0 and there is no maximum value.

The range of B) f(x) = -3x² is (-∞, 0], as the maximum value of the function is 0 and there is no minimum value.

c) The vertex of A) f(x)=x² /3 is at (0,0).

The vertex of B) f(x) = -3x² is at (0,0).

d) The axis of symmetry of both functions is the vertical line passing through the vertex, which is x = 0.

e) The minimum value of A) f(x)=x² /3 is 0, which occurs at the vertex.

f) The maximum value of B) f(x) = -3x² is 0, which occurs at the vertex.

g) A) f(x)=x² /3 is a horizontally shrunk version of the parent function f(x) = x² by a factor of 1/3.

B) f(x) = -3x² is a vertically stretched version of the parent function f(x) = x² by a factor of 3.

h) A) f(x)=x² /3 opens upward, as the coefficient of x² is positive.

B) f(x) = -3x² opens downward, as the coefficient of x² is negative.

The slope of the least-squares regression line is 0.50, which means that for each additional pound in weight, the child's height is expected to increase by 0.5 inches.

The slope of the least-squares regression line can be calculated using the formula:

Slope = (Σxy – (Σx)(Σy)/n) / (Σx2 – (Σx)2/n)

Where n is the number of data points, Σx is the sum of all x-values, Σy is the sum of all y-values, and Σxy is the sum of the products of the x-values and the y-values.

For example, consider a dataset with 10 data points, where the x-values are the heights in inches, and the y-values are the weights in pounds. The sum of the x-values, Σx, would be the total height of all 10 children, the sum of the y-values, Σy, would be the total weight of all 10 children, and the sum of the products of the x-values and y-values, Σxy, would be the total of the products of the heights and the weights for all 10 children. Using these values, the slope of the least-squares regression line would be:

Slope = (Σxy – (Σx)(Σy)/n) / (Σx2 – (Σx)2/n)

      = (2098 - (2040)(812)/10) / (4246 - (2040)2/10)

      = (98) / (1406)

      = 0.50

Therefore, the slope of the least-squares regression line is 0.50, which means for each additional pound in weight, the child's height is predicted to increase by 0.5 inches.

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Period gives the horizontal length of one cycle of a periodic function as [tex]2\pi[/tex].

Given that,

To determine which term gives the horizontal length of one cycle of a periodic function.

Functions is the relationship between sets of values. e g y=f(x), for every value of x there is its exists in a set of y. x is the independent variable while Y is the dependent variable.

Here,

In the periodic function 1 period is consist of 2π on the horizontal axis, so, the period represents the horizontal length of the periodic function.

Thus, Period gives the horizontal length of one cycle of a periodic function as 2π.

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Number of people with AB+ blood type = 3.4 / 100 x 300 .Number of people with AB+ blood type = 10.Therefore, of the 300 people who donated blood, approximately 10 people would have been AB+.

Assuming the distribution of blood types in Springfield are the same as the distribution in the US, then the percent of AB+ blood type donors would be 3.4%. Therefore, of the 300 people who donated blood, approximately 10 people would have been AB+. This calculation is based on the following formula: Percent of AB+ blood type donors = Number of people with AB+ blood type / Total number of people who donated Number of people with AB+ blood type = Percent of AB+ blood type donors / 100 x Total number of people who donated Number of people with AB+ blood type = 3.4 / 100 x 300 .Number of people with AB+ blood type = 10.

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Answer:

First, let's simplify the expression by combining like terms:

(5x-2y)(a-b) - (2x-y)(a-b)

= (5x-2y-2x+y)(a-b) // Distribute the (a-b) to each term

= (3x-y)(a-b)

Therefore, (5x-2y)(a-b) - (2x-y)(a-b) simplifies to (3x-y)(a-b).

The goal of this research is to evaluate the expression (5x-2y)(a-b)-(2x-y)(a-b). First, it is important to review the basic principles of algebra and the technical definitions of expressions and powers. This involves a recap of addition, subtraction, multiplication, and division of algebraic expressions.

Next, the expression under analysis needs to be broken down into the terms and factors. To achieve this, parentheses and binsomials need to be grouped and identified. This is a critical step in the evaluation process of the expression.

After this has been done, the algebraic steps for simplifying the expression need to be taken. This involves applying the commutative, associative, distributive and other relevant laws of algebra to achieve an answer in the simplest way. It is important to remember that each step needs to be documented and the source of the information should be clearly indicated.

In terms of sources, it is important to only select reliable websites, textbooks and journals approved by experts in the field. Examples of these are the American Mathematical Society, the Johns Hopkins University, and the Massachusetts Institute of Technology.

Finally, the expression needs to be scrutinized to ensure that all steps have been taken correctly and the outcome is what was expected. Once this has been completed, the answer can be documented and the paper/article can be published.

In conclusion, the expression (5x-2y)(a-b)-(2x-y)(a-b) can be evaluated through an organized approach involving the use of the fundamental principles of algebra and reliable sources for validating the findings.

The explicit formula of each arithmetic sequence is given as follows:

An arithmetic sequence is a sequence of values in which the difference between consecutive terms is constant and is called common difference d.

The nth term of an arithmetic sequence is given by the explicit formula presented as follows:

[tex]a_n = a_1 + (n - 1)d[/tex]

[tex]a_1[/tex] is the first term of the arithmetic sequence.

For each sequence in this problem, the first term and the common difference are obtained, then substituted into the equation, which is simplified.

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The terms denοminatοr and numeratοr are nοt directly related tο a mοdel unless the mοdel invοlves a fractiοn οr a ratiο.

The denοminatοr and numeratοr are terms οften used in mathematics and fractiοns. In a fractiοn, the numeratοr is the tοp number, and the denοminatοr is the bοttοm number. The numeratοr represents the number οf parts being cοnsidered οr cοunted, while the denοminatοr represents the tοtal number οf parts in the whοle.

The terms denοminatοr and numeratοr are nοt directly related tο a mοdel unless the mοdel invοlves a fractiοn οr a ratiο.

Hοwever, in statistical mοdels, the dependent and independent variables can be thοught οf as the numeratοr and denοminatοr οf a ratiο οr a fractiοn. The dependent variable represents the numeratοr, the number οf events οr οbservatiοns οf interest, while the independent variable represents the denοminatοr, the tοtal number οf events οr οbservatiοns.

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A new graph is produced from parent function, which is horizontally moved 6 units to the left, extended vertically, and shifted 2 units downward.

By performing numerous transformations, including shifts, stretches, and reflections, a parent function is a fundamental function that serves as the foundation for the creation of subsequent functions. Since they have straightforward, well-known qualities and are simple to alter to produce new functions, parent functions are frequently used. Linear, quadratic, cubic, square-root, absolute value, and exponential functions are a few examples of typical parent functions. Each parent function has a unique structure and set of characteristics that may be used to forecast how the function will behave after being changed.

The following procedures can be used to change the graph of the square root parent function, f(x) = x, to produce g(x) = 2 (x + 6) - 2.

Shift to the left by 6 units along the horizontal axis: The square root function's expression (x + 6) causes this shift.

Stretching the graph vertically is accomplished by multiplying the square root function by a factor of two.

Vertical shift: Next, a 2-unit downward shift is applied to the entire function.

A new graph is produced as a result of these modifications, which is horizontally moved 6 units to the left, extended vertically, and shifted 2 units downward.

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The size of the union of sets is determined using the Principle of Inclusion-Exclusion (PIE).

What is inclusion-exclusion principle?

The inclusion-exclusion principle is a counting method that generalises the well-known approach to determining the number of members in the union of two finite sets in the field of combinatorics.

The Principle of Inclusion-Exclusion (PIE) is a counting technique used to find the size of a union of sets.

It is often used when counting the number of elements that belong to one or more sets.

For a simple example, consider two sets A and B.

The size of their union (i.e., the number of elements that belong to A or B, or both) can be found using the formula -

|A ∪ B| = |A| + |B| - |A ∩ B|

Here, |A| represents the size of set A, |B| represents the size of set B, and |A ∩ B| represents the size of the intersection of A and B (i.e., the number of elements that belong to both A and B).

The formula says that to find the size of the union of A and B, we add the sizes of A and B, but then we need to subtract the size of the intersection of A and B, because we have counted those elements twice.

The Principle of Inclusion-Exclusion can be extended to n different sets, as follows -

|A₁ ∪ A₂ ∪ ... ∪ Aₙ| = ∑|Aᵢ| - ∑|Aᵢ ∩ Aⱼ| + ∑|Aᵢ ∩ Aⱼ ∩ Aₖ| - ... + (-1)ⁿ₋¹|A₁ ∩ A₂ ∩ ... ∩ Aₙ|

Here, the notation ∑ represents a sum, and the notation (-1)ⁿ₋¹ represents (-1) to the power of n-1.

The formula says that to find the size of the union of n different sets, we add up the sizes of all the individual sets, then subtract the sizes of all possible intersections of two sets, then add the sizes of all possible intersections of three sets, and so on, alternating between addition and subtraction, until we add or subtract the size of the intersection of all n sets, depending on whether n is even or odd.

Therefore, the PIE is defined and described for n different sets.

This formula can be used to count the number of elements in the union of any number of sets, but it can get quite complex for large values of n.

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Answer:

Cost of jar of cottage cheese = € 3.20

Cost of a bun = € 1.20

Step-by-step explanation:

Let the cost of 1 jar of cottage cheese = x

                              Let the cost of 1 bun = y

           Cost of 2 jar of cottage cheese  = 2x

                                      Cost of 3 bun    = 3y

Cost of 2 jars of cottage cheese + cost of 3 buns = € 10

         2x + 3y = 10 ------------------(I)

Cost of a jar of cottage cheese = 2 + cost of a bun

               x = 2 + y ----------------(II)

Substitute x = 2 + y in equation (I),

           2*(2+y) + 3y = 10

Use distributive property,

            2*2 + 2*y + 3y = 10

               4 + 2y + 3y = 10

Combine like terms,

                      4 + 5y = 10

Subtract 4 from both sides,

                           5y = 10 - 4

                           5y = 6

Divide both sides by 5

                             y = 6 ÷ 5

                             [tex]\boxed{\bf y = 1.20}[/tex]

Substitute y = 1.2 in equation (II),

        x = 2 + 1.2

        [tex]\boxed{\bf x = 3.20}[/tex]

Answer:

A jar of cottage cheese is €3.20

A bun is €1.20

Step-by-step explanation:

Let

x = Cost of a jar of cottage cheese (euros)

y = Cost of a bun (euros)

Step I:

Translate the statements mathematically:
     2 jars of cottage cheese cost = [tex]2x[/tex] euros

                                  3 buns cost  = [tex]3y[/tex] euros      
                 ∴ Total cost = [tex]2x + 3y = 10[/tex] euros        

A jar of cottage cheese is 2 euros more expensive than a bun: [tex]x = 2 + y[/tex]

Step II:

A system of linear simultaneous equations:

                                         [tex]x = 2 + y[/tex] ——(equation i)

                               [tex]2x + 3y = 10[/tex] ———-(equation ii)

Step III:

Solve the linear simultaneous equations either by the substitution, elimination or graphical method

Substitution method:

Substitute (equation i) into (equation ii) and solve for y:

[tex]2(2 + y) + 3y = 10[/tex]

Expand the parenthesis and make y the subject of the equation:

[tex]4 + 2y + 3y = 10[/tex]

[tex]2y + 3y = 10 - 4[/tex]

[tex]5y = 6[/tex]

[tex]y = \frac{6}{5}[/tex]

∴y = Cost of a bun = €1.20 (One euro and 20 cents)

Substitute this value of y in any of the equations to solve for x:

[tex]x = 2 + 1.20[/tex]

∴x = Cost of a jar = €3.20(Three euros and 20 cents)

(i). The required probability is approximately 0.486 or 48.6%.

(ii) The required probability is approximately 0.536 or 53.6%.

(iii) The required probability is approximately 0.329 or 32.9%.

Given:

Total employees (n) = 700

Employees with a life insurance policy (A) = 340

Employees with a medical insurance cover (B) = 280

Employees who participate in both programs (A ∩ B) = 150

i) To find the probability that a randomly selected employee will be a participant in at least one of the two programs (A or B), we need to calculate P(A ∪ B).

Using the inclusion-exclusion principle:

P(A ∪ B) = P(A) + P(B) - P(A ∩ B)

P(A ∪ B) = (340/700) + (280/700) - (150/700)

P(A ∪ B) = 0.671

Therefore, the probability that a randomly selected employee will be a participant in at least one of the two programs is approximately 0.486 or 48.6%.

ii) To determine the probability that an employee will be a participant in the life insurance plan given that he/she has medical insurance coverage, we need to find P(A | B).

Using the formula for conditional probability:

P(A | B) = P(A ∩ B) / P(B)

P(A | B) = (150/700) / (280/700)

P(A | B) = 0.536

Therefore, the probability that an employee will be a participant in the life insurance plan given that he/she has medical insurance coverage is approximately 0.536 or 53.6%.

iii) To determine the probability that one has none of the two insurance covers, we need to find the complement of P(A ∪ B), which is the probability of not being a participant in either program.

P(neither A nor B) = 1 - P(A ∪ B)

P(neither A nor B) = 1 - 0.671

P(neither A nor B) = 0.329

Therefore, the probability that an employee has none of the two insurance covers is approximately 0.329 or 32.9%.

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All three equations are satisfied when x = 3 and y = 2, which means that the lines intersect at the point (3, 2).

To find the coordinates of point P where the three lines intersect, we need to solve the system of equations formed by the three lines:

x = 3 (equation 1)

y - 2.5 = -(x - 0.5) (equation 2)

y - 2.5 = x - 3.5 (equation 3)

From equation 1, we know that x = 3. substituting this into equations 2 and 3, we get:

y - 2.5 = -2.5 (from equation 2)

y - 2.5 = -0.5 (from equation 3)

Simplifying these equations, we get:

y = 0 (from equation 2)

y = 2 (from equation 3)

So the coordinates of point P are (3, 2).

To verify that the lines all intersect at this point, we can substitute these coordinates into each of the original equations and check that they hold:

For equation 1: x = 3 holds when x = 3.

For equation 2: y - 2.5 = -(x - 0.5) becomes y - 2.5 = -(3 - 0.5) = -2 holds when x = 3 and y = 2.

For equation 3: y - 2.5 = x - 3.5 becomes y - 2.5 = 3 - 3.5 = -0.5 holds when x = 3 and y = 2.

So all three equations are satisfied when x = 3 and y = 2, which means that the lines intersect at the point (3, 2).

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Answer:  

1. A'(3,2),  B'(1,7), C'(-6,1)

Step-by-step explanation:

I only know 1. because you are reflecting from the y-axis so that being said

A' - intend of moving it to the left 3 you will move it to the right 3 and move up 2.

B' - intend of moving it to the left 1 you will move it to the right 1 and move up 7.

C' - intend of moving it to the right 6 you will move it to the left -6 and move up 1.

and were is the reflecting line happing at with Qs, 2 and 3.

Step-by-step explanation:

First one

5,5√5,25

Second one

-3,12,-48

Answer:

[tex](a+b)^2(a^2-ab+b^2)[/tex]

Answer:

B. 1/36

Step-by-step explanation:

A dice has 6 sides, we are looking to roll a 5, which is just one number, hence 1/6. If you roll two, to find the probability of two independent events (meaning they do not affect each other), you multiply the two together.

1/6 x 1/6 = 1/36

The image contains the answer to the questions.

1) A nonagon is a polygon with nine sides.

To find the sum of the interior angles of a nonagon, we can use the formula:

aggregate of interior angles = (n - 2) × 180°

where n stands for the number of sides of the polygon.

Substituting n = 9 for a nonagon, we get:

sum of interior angles = (9 - 2) × 180° = 7 × 180°

Thus, the aggregate of the interior angles of a nonagon is:

sum of interior angles = 1260°

2)

To find the sum of the interior angles of a 17-gon, we can use the formula:

aggregate of interior angles = (n - 2) × 180°

where n stands for the number of sides of the polygon.

Substituting n = 17 for a 17-gon, we get:

sum of interior angles = (17 - 2) × 180° = 15 × 180°

Thus, the aggregate of the interior angles of a 17-gon is:

sum of interior angles = 2700°

3)
It is correct to state that a hexagon can be defined as a polygon with six sides.

To find the sum of the interior angles of a hexagon, we can use the formula:

aggregate of interior angles = (n - 2) × 180°

where n refers to the number of sides of the polygon.

Replacing n = 6 for a hexagon, we get:

sum of interior angles = (6 - 2) × 180° = 4 × 180°

Therefore, the sum of the interior angles of a hexagon is:

sum of interior angles = 720°

4)
To find the sum of the interior angles of a regular 20-gon, we can use the formula:

aggregate of interior angles = (n - 2) × 180°

where n refers to the number of sides of the polygon.

Substituting n = 20 for a 20-gon, we get:

sum of interior angles = (20 - 2) × 180 degrees = 18 × 180°

Thus, the sum of the interior angles of a regular 20-gon is:

sum of interior angles = 3,240°

5)
A regular octagon is a polygon with eight sides that are all congruent and eight angles that are all congruent.

To find the measure of each exterior angle of a regular octagon, we can use the formula:

dimensions of each exterior angle = 360° ÷ number of sides

For a regular octagon, the number of sides is 8. Replacing this value into the formula, we get:

measure of each exterior angle = 360° ÷ 8

Simplifying this expression, we get:

the dimensions of each exterior angle = 45°

Therefore, the dimensions of each exterior angle of a regular octagon is 45°.

6)

A regular 24-gon is a polygon with 24 sides that are all congruent and 24 angles that are all congruent.

To find the measure of each exterior angle of a regular 24-gon, we can use the formula:

mensuration of each exterior angle = 360° ÷ number of sides

For a regular 24-gon, the number of sides is 24. Replacing this value into the formula, we get:

measure of each exterior angle = 360° ÷ 24

Simplifying this expression, we get:

The measure of each exterior angle = 15°

Therefore, the measure of each exterior angle of a regular 24-gon is 15°

7)
The sum of the interior angles of any pentagon can be calculated using the formula:

Aggregate of interior angles = (n - 2) × 180°

where n refers the number of sides of the polygon.

For a pentagon, n = 5, so we have:

Aggregate of interior angles = (5 - 2) × 180° = 3 × 180° = 540°.

We can use this fact to set up an equation using the given expressions for the interior angles:

(5x + 2) + (7x - 11) + (13x - 31) + (8x - 19) + (10x - 3) = 540

Simplifying and solving for x, we get:

43x - 62 = 540

43x = 602

x = 14

Therefore, x = 14.

8)

The sum of the exterior angles of any polygon is always 360 degrees. Therefore, we can add the six exterior angles of the hexagon to get:

(11x-30) + 5x + 50 + (2x+60) + (6x-10) + 50 = 360

Simplifying and solving for x, we get:

24x + 120 = 360

24x = 240

x = 10

Therefore, x = 10.

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The area under the standard normal curve to the left of z=-2.77 and to the right of z=-2.22 is 0.0167-0.0033 = 0.0134. This answer is rounded to four decimal places, so the answer is 0.0134.

Area is a two-dimensional measurement, defined as the amount of two-dimensional space taken up by a shape or object. It is measured in units such as square meters, square kilometers, or square feet.

The area under the standard normal curve to the left of z=-2.77 and to the right of z=-2.22 can be calculated using the normal tables. The normal table shows the area under the standard normal curve from 0 up to the given z-value. Using the normal table, the area to the left of z=-2.77 is 0.0033 and the area to the right of z=-2.22 is 0.0167.

The normal table is a useful tool for calculating the area under the standard normal curve for different z-values. The table is organized such that the row headers are the z-values and the column headers are the area under the curve from 0 up to the given z-value. By looking up the z-values in the table, we can calculate the area under the standard normal curve for any given area. This makes it easy to calculate the area under the standard normal curve for any given set of z-values.

Using a standard normal table, the area to the left of z = -2.77 is 0.0028 (rounded to four decimal places), and the area to the right of z = -2.22 is 0.0139 (rounded to four decimal places).

Therefore, the area under the standard normal curve to the left of z = -2.77 and to the right of z = -2.22 is:

0.0028 + 0.0139 = 0.0167 (rounded to four decimal places)

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The linear model, based on the residual plot shown and the data from the 12 students is appropriate because D. Yes, about half of the residuals are positive and half are negative.

When analyzing a residual plot, an appropriate linear model should display the following characteristics:

Looking at the residual plot for the hours spent by students doing homework and their performance on exams, we can see that the residuals are scattered randomly, there is no apparent pattern and the number of residuals above and below the line are roughly equal.

The linear model is therefore best.

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Therefore, the equations that have the same solution as 2.3p – 10.1 = 6.5p – 4 – 0.01p are: 2.3p – 10.1 = 6.4p – 4 and 23p – 101 = 65p – 40 – p.

In mathematics, an equation is a statement that two expressions are equal. It typically contains one or more variables (unknowns) and specifies a relationship between those variables. Equations are used to model real-world phenomena, solve problems, and make predictions. There are many types of equations in mathematics, including linear equations, quadratic equations, polynomial equations, exponential equations, trigonometric equations, and many more. Each type of equation has its own set of methods and techniques for solving it.

Here,

To rewrite the given equation using properties, we can simplify both sides by combining like terms and then isolate the variable term on one side of the equation:

2.3p – 10.1 = 6.5p – 4 – 0.01p

2.3p - 6.5p + 0.01p = -4 + 10.1

-4.19p = 6.1

p = -6.1/4.19

To check which equations have the same solution, we can substitute this value of p into each equation and see if both sides are equal:

2.3p – 10.1 = 6.4p – 4

2.3(-6.1/4.19) - 10.1 = 6.4(-6.1/4.19) - 4

-9.84 = -9.84

This equation has the same solution as the original equation.

23p – 101 = 65p – 40 – p

23(-6.1/4.19) - 101 = 65(-6.1/4.19) - (-6.1/4.19)

-63.64 = -63.64

This equation also has the same solution as the original equation.

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The evaluation of the questions in the parts using substitution method, can be presented as follows;

9. First part; The mistake is the assumption that there are no solution; The equation have an infinite number of solutions

Second part; The main difference between solving a system of equations by graphing and solving by substitution is that graphing involves visualizing the equations, while substitution involves algebraic manipulation.

Solving by graphing can be useful to find a quick estimate of the solution of the equation system, while substitution is useful for finding the exact solution to the equations.

Third part; The dimensions are;

Length, L = 11.8 feet

Width, W = 7.2 feet

Fourth part; Zaid made 4 two-points basket, and 3 three-point baskets in the game.

The substitution method used for solving a system of equations involves solving one of the equations for one of the variables, and then substituting the expressions obtained into the other equation.

First part;

The first problem can be expressed as follows;

x + y = 7

2·x + 3·y = 17

The substitution method can be used to find the solution to the above system of equations as follows;

x = 7 - y

The above expression for the variable x can be substituted in the second equation as follows;

2·(7 - y) + 3·y = 17

Therefore; 14 - 2·y + 3·y = 17

The combination like terms, indicates;

y = 17 - 14 = 3

y = 3

Therefore; x + 3 = 7

x = 7 - 3 = 4

x = 4

Therefore, Zaid made 4 two-point baskets and 3 three-point baskets in the game

Therefore, the number of two-point basket Zaid made are 4, and the number of three-point basket he made in the game are 3

Second part;

The system of equations in the situation is presented as follows;

L = W + 4.6

2·L + 2·W = 38

The substitution of the variables can be used to solve the system of equations as follows;

2·(W + 4.6) + 2·W = 38

Simplifying the above equation, we get;

4·W + 9.2 = 38

Therefore; W = (38 - 9.2)/4 = 28.8/4 = 7.2

W = 7.2

Substituting the value of W in the above equation for L, we get;

L = 7.2 + 4.6 = 11.8

L = 11.8

The dimensions of the rectangle are therefore;

Length, L = 11.8 feet

Width, W = 7.2 feet

Third Part;

Solving a system of equations by graphing involves graphing the equations on the same coordinate plane and finding the point of intersection of the two lines. The point of intersection represents the solution to the system of equations.

Solving a system of equations by substitution involves solving one of the equations for one of the variables in terms of the variable, and then substituting this expression into the other equation. This results in an equation with only one variable, which can be solved to find the value of the variable. Once one variable is found, the other variable can be found by substituting the value of the value of the first variable into one of the original equations.

Fourth part;

The equations; y = x - 1, and y - x = -1 are the same equation, therefore, the equations have infinite number of solutions

Therefore;

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Answer:

x=5

Step-by-step explanation:

when to solve an equation which was given as 2x=10 then you have to make x the subject so you will divide 10 by the coefficient of x by 2x=10 then you will get your answer to be 5 as simple as that

Using permutation and combination concept, there are 358,800 different passwords that are possible and the number of more passwords available through this combination is 1054920

(a) To find the number of different passwords that are possible, we can use the permutation formula. Since there are 26 letters in the alphabet and we are choosing 4 letters without repetition, we can write:

Number of possible passwords = P(26, 4)

= 26 x 25 x 24 x 23

= 358,800

Therefore, there are 358,800 different passwords that are possible.

(b) If the numbers 1 through 10 are also available to be chosen only once in addition to the alphabet, we can use the same permutation formula to find the number of different passwords that are possible. Since there are now 36 characters to choose from (26 letters + 10 numbers), and we are choosing 4 characters without repetition, we can write:

Number of possible passwords = P(36, 4)

P(36, 4) - P(26, 4) = 1054920

The number of more passwords available through this combination is 1054920

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