Generally speaking, if two variables are unrelated (as one increases, the other shows no pattern), the covariance will be a. a large positive number b. a large negative number c. a positive or negative number close to zero d. None of the above

Hello!

x = 1 score

the mean:

16x/16 = 8

x = 8

so the sum of the 16 scores = 8 × 16 = 128

verify:

128/16 = 8

If a set of 16 scores has a mean of 8, the sum of the scores is 128.

Given: Total number of scores =  16

Mean of scores = 8

The formula for calculating the mean of a given data is given as,

x = ∑x / n ...........(i)

where x⇒ mean of scores,

∑x ⇒ sum of the scores

n⇒ total number of scores,

∴ Putting the relevant values in equation (i), we get,

8 = ∑x /16

⇒ ∑x  = 8 x 16 ;

∴ ∑x = 128

So, if a set of 16 scores has a mean of 8, the sum of the scores is 128.

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The standard matrix A for the described linear transformation is:

A = [[-sqrt(2)/2, sqrt(2)/2],

    [sqrt(2)/2,  sqrt(2)/2]]

To determine the standard matrix A for the given linear transformation, we need to understand how each operation affects the standard basis vectors i and j.

(i) Rotating points through π/4 clockwise:

When we rotate a point through an angle α clockwise, the new x-coordinate is given by x' = cos(α)x - sin(α)y, and the new y-coordinate is given by y' = sin(α)x + cos(α)y. In this case, α = π/4.

Applying the rotation to the standard basis vectors, we have:

i' = cos(π/4)i - sin(π/4)j

= (1/sqrt(2))i - (1/sqrt(2))j

j' = sin(π/4)i + cos(π/4)j

= (1/sqrt(2))i + (1/sqrt(2))j

(ii) Reflecting points through the vertical x2-axis:

To reflect a point through the x2-axis, we negate the y-coordinate while keeping the x-coordinate unchanged.

Applying the reflection to the rotated basis vectors, we have:

i'' = (1/sqrt(2))i' - (1/sqrt(2))j'

= (1/sqrt(2))[(1/sqrt(2))i - (1/sqrt(2))j] - (1/sqrt(2))[(1/sqrt(2))i + (1/sqrt(2))j]

= (-sqrt(2)/2)i

j'' = (1/sqrt(2))i' + (1/sqrt(2))j'

= (1/sqrt(2))[(1/sqrt(2))i - (1/sqrt(2))j] + (1/sqrt(2))[(1/sqrt(2))i + (1/sqrt(2))j]

= (sqrt(2)/2)j

The resulting vectors i'' and j'' give us the columns of the standard matrix A.

Therefore, the standard matrix A for the described linear transformation is:

A = [[-sqrt(2)/2, sqrt(2)/2],

    [sqrt(2)/2,  sqrt(2)/2]]

This matrix can be used to transform any vector in R^2 through the specified sequence of operations: rotation by π/4 clockwise followed by reflection through the vertical x2-axis.

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The value of probability that Fazio selects a striped jersey both times is,

⇒ 1 / 25

Since,

A probability is the number of desired outcomes divided by the number of total outcomes.

In this problem:

For each jersey, there are possible options, two of which are striped, is,

2+5+3 = 10

So, twice shirts probability,

⇒ 2/10

p = (2/10)² = 4/100 = 1/25

Thus, The value of probability that Fazio selects a striped jersey both times is,

⇒ 1 / 25

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n = 5, which means that the value of n falls in the range 3 < n < 6.

The correct answer is (A).

Finding the value of n for an n x n square matrix A with three distinct eigenvalues and the dimension of each of its eigenspaces being 2 or less, given that A is diagonalizable.
A matrix is diagonalizable if and only if the sum of the dimensions of its eigenspaces is equal to the size of the matrix, which in this case is n.
Since there are three distinct eigenvalues and the dimension of each eigenspace is 2 or less, the maximum possible sum of the dimensions of the eigenspaces is[tex]3 \times 2 = 6.[/tex]

However, if the sum were equal to 6, the eigenspace dimensions would be 2, 2, and 2, which would mean there are 4 distinct eigenvalues, contradicting the given information.
Therefore, the sum of the dimensions of the eigenspaces must be less than 6.

Given that there are three eigenvalues, the only possible sum of eigenspace dimensions is 5, with dimensions 2, 2, and 1 for each eigenvalue.

The correct answer is (A).
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The sum of the dimensions of the eigenspaces equals the dimension of the matrix, n, we know that 3 ≤ n ≤ 6. Therefore, the answer is (A) 3 < n < 6.

We know that A is diagonalizable, which means that it can be written in form A = PDP^-1, where D is a diagonal matrix whose entries are the eigenvalues of A, and P is a matrix whose columns are the eigenvectors of A.

Since A is an n x n square matrix with exactly three distinct eigenvalues and is diagonalizable, we know that the sum of the dimensions of its eigenspaces must equal n.

Let the three distinct eigenvalues be λ1, λ2, and λ3, with eigenspaces E1, E2, and E3 respectively. We are given that the dimension of each eigenspace is 2 or less, so:

dim(E1) ≤ 2, dim(E2) ≤ 2, and dim(E3) ≤ 2.

Now, we can write the sum of the dimensions of the eigenspaces:

dim(E1) + dim(E2) + dim(E3) = n.

Since each dimension is at most 2, the maximum value of the sum is:

2 + 2 + 2 = 6.

However, we know that there are three distinct eigenvalues, so each eigenspace must have a dimension of at least 1. Therefore, the minimum value of the sum is:

1 + 1 + 1 = 3.

Combining this information, we can conclude that:

3 ≤ n ≤ 6.

Hence, the value of n falls in the range (A) 3 < n < 6.

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The amount that is closest to the value of the car 10 years after it was purchased is $5,500. The correct option is (C) $5,500.

We can model the car value data using an exponential function of the form:

V(t) = Ve⁻ᵇⁿ

where V(t) is the car value at time t, V is the initial car value, e is the mathematical constant e (approximately 2.71828), and b is a constant that determines the rate of decay of the car value.

To find the exponential function that models the data, we can use the fact that the car value is $17,000 when n = 1, and use one of the other data points to solve for k:

$17,000 = Ve⁻ᵇ

V = $17,000/e⁻ᵇ

$14,450 = Ve⁻²ᵇ

$14,450 = $17,000/e⁻ᵇVe⁻²ᵇ

e⁻³ᵇ = $17,000/$14,450

e⁻³ᵇ = 1.1768

-3b = ln(1.1768)

k = -0.0885

Therefore, the exponential function that models the car value data is:

V(t) = $17,000e⁻⁰⁸⁸⁵ⁿ

To find the value of the car 10 years after it was purchased, we can simply plug in t = 10 into the function:

V(10) = $5,499.45

Therefore, the amount that is closest to the value of the car 10 years after it was purchased is $5,500. The answer is (C) $5,500.

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To obtain 6 cups of Roquefort dressing, we need 1 lb of Roquefort cheese, 2 cups of sour cream, 2 cups of mayonnaise, 1/4 cup of white wine vinegar, and 1 1/3 tbsp of sugar.

To obtain 6 cups of Roquefort dressing from a recipe that makes 1 1/2 cups, we need to scale up the ingredients by a factor of 4. To find the amount of each ingredient in the scaled-up recipe, we multiply the original amounts by 4. The ingredients and their scaled-up amounts are as follows:

a. Roquefort cheese: 4 oz (original amount) x 4 = 16 oz or 1 lb (scaled-up amount)

b. Sour cream: 1/2 cup (original amount) x 4 = 2 cups (scaled-up amount)

c. Mayonnaise: 1/2 cup (original amount) x 4 = 2 cups (scaled-up amount)

d. White wine vinegar: 1 tbsp (original amount) x 4 = 4 tbsp or 1/4 cup (scaled-up amount)

e. Sugar: 1 tsp (original amount) x 4 = 4 tsp or 1 1/3 tbsp (scaled-up amount)

Therefore, to obtain 6 cups of Roquefort dressing, we need 1 lb of Roquefort cheese, 2 cups of sour cream, 2 cups of mayonnaise, 1/4 cup of white wine vinegar, and 1 1/3 tbsp of sugar.

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To show that the product of the sample observations is a sufficient statistic for θ > 0 in the case of a random sample taken from a gamma distribution with parameters α = θ and β = 6, we can use the factorization theorem for sufficient statistics.

Let's denote the random sample as X₁, X₂, ..., Xₙ, where each Xi is an independent and identically distributed random variable following a gamma distribution with parameters α = θ and β = 6.

The probability density function (pdf) of a gamma distribution with parameters α and β is given by:

f(x; α, β) = (1 / (β^α * Γ(α))) * (x^(α - 1)) * exp(-x / β)

where Γ(α) is the gamma function.

The joint pdf of the random sample can be expressed as:

f(x₁, x₂, ..., xₙ; α, β) = (1 / (β^(nα) * Γ(α)^n)) * (x₁ * x₂ * ... * xₙ)^(α - 1) * exp(-(x₁ + x₂ + ... + xₙ) / β)

By the factorization theorem, the product of the sample observations, denoted as T = x₁ * x₂ * ... * xₙ, is a sufficient statistic for θ if we can express the joint pdf as the product of two functions, one depending on the sample observations T and the other on the parameter θ.

Let's rewrite the joint pdf in terms of T:

f(x₁, x₂, ..., xₙ; α, β) = (1 / (β^(nα) * Γ(α)^n)) * T^(α - 1) * exp(-(x₁ + x₂ + ... + xₙ) / β)

Now, we can separate the terms depending on T and θ:

f(x₁, x₂, ..., xₙ; α, β) = (1 / (β^(nα) * Γ(α)^n)) * T^(α - 1) * exp(-(x₁ + x₂ + ... + xₙ) / β) = g(T; α) * h(x₁, x₂, ..., xₙ; β)

Here, we can observe that g(T; α) = (1 / (β^(nα) * Γ(α)^n)) * T^(α - 1) depends only on T and α, and h(x₁, x₂, ..., xₙ; β) = exp(-(x₁ + x₂ + ... + xₙ) / β) depends only on the sample observations and β.

Therefore, we have successfully factorized the joint pdf into two functions, one depending on T and α, and the other depending on the sample observations and β. This confirms that the product of the sample observations T = x₁ * x₂ * ... * xₙ is a sufficient statistic for the parameter θ when the random sample is taken from a gamma distribution with parameters α = θ and β = 6.

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The specific memory location where the records are stored is determined by the storage and retrieval system being used, and is not something that can be determined without more information about the system.

The memory location where we should store the records for the customer with social security number 022112736 depends on the data storage and retrieval system being used.

If we are using a database management system (DBMS), we would typically create a table to store the customer records, with columns for each of the relevant fields (e.g., name, address, social security number, etc.). The DBMS would then assign a physical location to the table, which could be on disk or in memory, depending on the implementation.

Within the table, each record (i.e., row) would be assigned a unique identifier, such as a primary key, that would allow us to retrieve the record for a particular customer using their social security number.

If we are using a file-based system, we might store the records for each customer in a separate file, with the file name being based on the customer's social security number (e.g., "022112736.txt").

The files could be stored in a directory on disk, with the directory location being determined by the system administrator.

In either case, the specific memory location where the records are stored is determined by the storage and retrieval system being used, and is not something that can be determined without more information about the system.

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The algorithm has a computational complexity of O(m * n), where m is the length of string x and n is the length of string y.

To determine if string s is an interweaving of strings xand y, you can use a dynamic programming approach. Here's an efficient algorithm to solve this problem:

1. Check if the length of s is equal to the sum of the lengths of x and y. If not, return false.

2. Create a 2D boolean array, dp, with dimensions (length of x + 1) by (length of y + 1).

3. Initialize dp[0][0] as true, indicating that an empty s is an interweaving of empty x and empty y.

4. Iterate over x from index 0 to its length:

    a. If s[i-1] is equal to x [i-1] and dp[i-1] [0] is true, set dp[i] [0] as true.

5. Iterate over y from index 0 to its length:

    a. If s[j-1] is equal to y [j-1] and dp[0] [j-1] is true, set dp[0 ][j] as true.

6. Iterate over x from index 1 to its length and y from index 1 to its length:

    a. If s [i+j-1] is equal to x[i-1] and dp[i-1] [j] is true, set dp[i] [j] as true.

    b. If s [i+j-1] is equal to y [j-1] and dp[i] [j-1] is true, set dp[i] [j] as true.

7. Return dp [length of x] [length of y], which indicates if s is an interweaving of x and y.

The computational complexity of this algorithm is O(m * n), where m is the length of string x and n is the length of string y. This is because we are filling in a 2D array of size (m+1) by (n+1) with each cell requiring constant time operations. Thus, the overall time complexity of the algorithm is linear in the product of the lengths of x and y.

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Using the unitary method, we found that Mary used 11 1/2 cups of flour altogether in the two recipes.

Mary had 6 3/4 cups of flour, which can be written as 27/4 cups of flour. We can multiply the whole number 6 by the denominator 4, which gives us 24. Adding the numerator 3 to this product gives us a total of 27. Therefore, 6 3/4 cups of flour is equivalent to 27/4 cups of flour.

Now that we have all the quantities in the same units, we can add them together. To add fractions, we need a common denominator. In this case, the common denominator is 4.

27/4 cups of flour + 5/2 cups of flour + 9/4 cups of flour

To add fractions, we need the denominators to be the same. We can rewrite 5/2 as an equivalent fraction with a denominator of 4 by multiplying the numerator and denominator by 2:

27/4 cups of flour + (5 * 2)/(2 * 2) cups of flour + 9/4 cups of flour

27/4 cups of flour + 10/4 cups of flour + 9/4 cups of flour

Now that we have a common denominator, we can add the numerators together:

(27 + 10 + 9)/4 cups of flour

46/4 cups of flour

To simplify this fraction, we can divide both the numerator and denominator by their greatest common divisor, which is 2:

46 ÷ 2 / 4 ÷ 2 cups of flour

23/2 cups of flour

Since 23/2 can be simplified further, we can express it as a mixed number:

23 ÷ 2 = 11 with a remainder of 1

So, the total amount of flour Mary used altogether is 11 1/2 cups.

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Complete Question:

Mary had 6 3/4 cups of floor. She used 2 1/2 cups of flour in one recipe and 2 1/4 cups of flour in another.

How much flour did she use altogether?

Answer:

b

Step-by-step explanation:

There are 6.7 parts in each of the new car

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

There were 9 toy cars each with 10 parts

So, the ratio is

Ratio = 10 parts/9 cars

The boy created 6 cars

This means that the the number of parts in each car is

Parts = 6 cars * 10 parts/9 cars

Evaluate

Parts = 6.7

Hence, there are 6.7 parts in each of the new car

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To obtain the essential prime implicants and a minimum sum of products (SOP) expression for the complement of the function, we need to analyze the map shown in the figure. The essential prime implicants are the minimal combinations of input variables that cover at least one minterm that is not covered by any other implicant.

By examining the map, we can identify the minterms that are not covered by any larger implicant. These minterms correspond to the "don't care" or "X" entries in the map. We then identify the prime implicants that cover these essential minterms.

The essential prime implicants are minimal combinations of variables that are necessary to cover these minterms. We select the essential prime implicants that cover the essential minterms and combine them to form the minimum SOP expression for the complement of the function.

To obtain the minimum SOP expression, we use the selected essential prime implicants and combine them with necessary non-essential prime implicants to cover the remaining minterms in the function. This process ensures that the resulting expression is minimal, with the fewest terms and variables required to represent the function.

By analyzing the map, identifying the essential prime implicants, and combining them appropriately, we can derive a minimum SOP expression for the complement of the function.

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To find the average cost per item to produce 50 items, we need to divide the total cost of manufacturing 50 items by 50.

First, let's plug in x = 50 into the cost function C = 100 + 80x:

C = 100 + 80(50)

C = 100 + 4000

C = 4100

So, it costs $4100 to manufacture 50 items.

To find the average cost per item, we divide the total cost by the number of items:

Average cost per item = total cost / number of items

Average cost per item = $4100 / 50

Average cost per item = $82

Therefore, the average cost per item to produce 50 items is $82.

It's worth noting that the cost function given in the question assumes that the cost of manufacturing each item remains constant as more items are produced. This is known as the "constant marginal cost assumption". In reality, however, the cost to manufacture each additional item may increase due to factors such as diminishing returns or economies of scale.

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The measure of arc XZ is 115 degrees and  measure of arc XYZ is 245 degrees

The given circle has a centre W

The measure of central angle is 115 degrees

We have to find the measure of the arc XZ

The central angle is equal to measure of the arc

115 = measure of arc XZ

Arc XZ =115 degrees

We know that the circle has a measure of 360 degrees

So the remaining angle is 360-115 = 245 degrees

The measure of arc XYZ is 245 degrees

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Answer:

B. unlikely

Step-by-step explanation:

On a cube numbered 1 through 6, there is only one number that is less than 2, which is 1.

So, the probability of rolling less than a 2 is:

[tex]\dfrac{\#\text{ desired outcomes}}{\# \text{ total outcomes}}[/tex]

[tex]= \dfrac{1}{6}[/tex]

[tex]\approx 16.67\%[/tex]

This probability can be considered unlikely.

Differential equations (DEs) are mathematical equations that describe the relationship between a function and its derivatives. DEs are used in many fields, including physics, engineering, economics, biology, and more, to model real-world phenomena.

The use of DEs in modeling real-world data involves several steps. First, the problem must be defined and the relevant variables and parameters identified. Next, a DE that describes the relationship between these variables and parameters is formulated. This DE can be based on empirical data, physical laws, or other considerations, depending on the specific application.

Once a DE is formulated, it can be solved using various techniques, such as separation of variables, numerical methods, or Laplace transforms. The solution to the DE gives the functional relationship between the variables of interest, which can then be used to make predictions or analyze the system.

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A factor pair of a number is a pair of two numbers whose product is equal to that number.

[tex]1\cdot12=12\Rightarrow \checkmark\\2\cdot4=8\Rightarrow \textsf{x}\\2\cdot6=12\Rightarrow\checkmark\\3\cdot4=12\Rightarrow \checkmark\\3\cdot5=15\Rightarrow \textsf{x}\\[/tex]

The product of [tex]-2x^{3}[/tex] + x - 5 and [tex]x^{3}[/tex] - 3x - 4 is [tex]-2x^{6}[/tex] + [tex]7x^{4}[/tex] + [tex]3x^{3}[/tex] + [tex]12x^{2}[/tex] - 4x + 20. The order of the polynomials does not affect the result; they yield the same product.

a) To find the product of [tex]-2x^{3}[/tex] + x - 5 and [tex]x^{3}[/tex] - 3x - 4, we multiply each term in the first expression by each term in the second expression and combine like terms.

[tex]-2x^{3}[/tex] * [tex]x^{3}[/tex] = -2[tex]x^{6}[/tex]

[tex]-2x^{3}[/tex] * (-3x) = 6[tex]x^{4}[/tex]

[tex]-2x^{3}[/tex] * (-4) = 8[tex]x^{3}[/tex]

x * [tex]x^{3}[/tex] = [tex]x^{4}[/tex]

x * (-3x) = -3[tex]x^{2}[/tex]

x * (-4) = -4x

-5 * [tex]x^{3}[/tex] = -5[tex]x^{3}[/tex]

-5 * (-3x) = 15[tex]x^{2}[/tex]

-5 * (-4) = 20

Combining all the terms, we have:

-2[tex]x^{6}[/tex] + 6[tex]x^{4}[/tex] + 8[tex]x^{3}[/tex] + [tex]x^{4}[/tex] - 3[tex]x^{2}[/tex] - 4x - 5[tex]x^{3}[/tex] + 15[tex]x^{2}[/tex] + 20

Simplifying further:

-2[tex]x^{6}[/tex]+ 7[tex]x^{4}[/tex] + 3[tex]x^{3}[/tex] + 12[tex]x^{2}[/tex] - 4x + 20

Therefore, the product of -2[tex]x^{3}[/tex] + x - 5 and [tex]x^{3}[/tex] - 3x - 4 is -2[tex]x^{6}[/tex] + 7[tex]x^{4}[/tex] + 3[tex]x^{3}[/tex] + 12[tex]x^{2}[/tex] - 4x + 20.

(b) The product of two polynomials is commutative, which means that changing the order of the polynomials being multiplied does not affect the result. In other words, the product of [tex]x^{3}[/tex] - 3x - 4 and -2[tex]x^{3}[/tex] + x - 5 will be the same as the product obtained in part (a).

Therefore, the product of -2[tex]x^{3}[/tex] + x - 5 and [tex]x^{3}[/tex] - 3x - 4 is equal to the product of [tex]x^{3}[/tex] - 3x - 4 and -2[tex]x^{3}[/tex] + x - 5. The order of the polynomials being multiplied does not impact the final result, so both expressions yield the same product.

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The inverse of the matrix is  1/(b³ - c³ - a*b² + a*c² + a²*c - a²*b)*[[(b² - c²), (-b³ + c³), (a*c - a²)], [-(b² - c²), (a*c² - a²*b - 1), (a² - a)], [(b*c - c²), (a - a²*b), (a² - b)]]

To find the inverse of the matrix:

M = [[1, a, a²], [1, b, b²], [1, c, c²]]

We can use the formula for the inverse of a 3x3 matrix:

If A = [[a, b, c], [d, e, f], [g, h, i]], then the inverse of A, denoted as A⁻¹, is given by:

A⁻¹ = (1/det(A)) * [[e×i - f×h, c×h - b×i, b×f - c×e], [f×g - d×i, a×i - c×g, c×d - a×f], [d×h - g×e, b×g - a×h, a×e - b×d]]

where det(A) is the determinant of A.

In our case, we have:

A = [[1, a, a²], [1, b, b²], [1, c, c²]]

Using the above formula, we can find the inverse:

det(A) = (1 * (b*b² - c*c²)) - (a * (1*b² - c*c²)) + (a² * (1*c - b*c))

= b³ - c³ - a*b² + a*c² + a²*c - a²*b

Now, we can compute the entries of the inverse matrix:

A⁻¹ = (1/det(A)) * [[(b² - c²), (c*c² - b*b²), (a*c - a²)], [(c² - b²), (1 - a*c² + a²*b), (a² - a)], [(b*c - c²), (a - a²*b), (a² - b)]]

Simplifying further, we have:

A⁻¹ = (1/det(A)) * [[(b² - c²), (-b³ + c³), (a*c - a²)], [-(b² - c²2), (a*c² - a²*b - 1), (a² - a)], [(b*c - c²), (a - a²*b), (a² - b)]]

Therefore, the inverse of the matrix M is:

M⁻¹ = (1/det(M)) * [[(b² - c²), (-b³ + c³), (a*c - a²)], [-(b² - c²), (a*c² - a²*b - 1), (a² - a)], [(b*c - c²), (a - a²*b), (a² - b)]]

M⁻¹ = 1/(b³ - c³ - a*b² + a*c² + a²*c - a²*b)*[[(b² - c²), (-b³ + c³), (a*c - a²)], [-(b² - c²), (a*c² - a²*b - 1), (a² - a)], [(b*c - c²), (a - a²*b), (a² - b)]]

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For a regular polygon of n sides, we need to use the formula (n-2) * 180°.

To determine how many degrees would be in "one turn" of any regular polygon, you can use the following method:

To determine how many degrees would be in "one turn" of the regular polygon, simply multiply the measure of each interior angle by the number of sides: [(n-2) * 180 / n] * n.

The final expression simplifies to (n-2) * 180°

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A) The probability that a randomly selected coffee drinker does not use sugar or cream = 0.10

B) The probability that a randomly selected coffee drinker uses sugar or cream = 0.90

People who uses cream in coffee = 70%

P(C) = 0.7

People who uses sugar in coffee = 55%

P(S) = 0.55

People who uses both in coffee and sugar = 35%

P(C or S ) = 0.35

Probability that a randomly selected coffee drinker does not use sugar or cream  = 0.10

Area outside of the diagram mean who doesn't take either sugar or cream in coffee

The probability that a randomly selected coffee drinker uses sugar or cream = P(C) + P(S) - P(C OR S)

= 0.70 + 0.55 - 0.35

= 0.90

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The present value (PV) is $3000.45 when it is rounded to two decimal places.

We can use the following formula for the present value of an annuity:

PV = PMT * [(1 - (1 + i)^(-n)) / i]

Here, n = 20, i = 0.027, and PMT = $207. Now, plug in the values:

PV = 207 * [(1 - (1 + 0.027)^(-20)) / 0.027]

First, calculate the values inside the parentheses:

(1 + 0.027)^(-20) = 0.60829 (rounded to 5 decimal places)

Next, subtract this value from 1:

1 - 0.60829 = 0.39171 (rounded to 5 decimal places)

Now, divide the result by the interest rate:

0.39171 / 0.027 = 14.50704 (rounded to 5 decimal places)

Finally, multiply this value by the payment amount:

207 * 14.50704 = 3000.45

So, the present value (PV) is $3000.45 when rounded to two decimal places.

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Given: y=4 -6x - 5y=22

We need to solve the system of equation by the substitution method:

Substitute the value of y from equation (1) into equation (2):

y = 4 - 6x ...(1)

-5y = 22

Simplify:

Divide by -5 on both sides.

y = -22/(-5)y = 22/5

Put the value of y in equation (1):

y = 4 - 6x22/5 = 4 - 6x6x = 4 - 22/5

Multiplying by 5 on both sides:

30x = 20 - 22

Simplify:

30x = -2

Dividing by 2 on both sides:

x = -1/15

Putting the value of x in equation (1):

y = 4 - 6x = 4 - 6(-1/15) = 4 + 2/5 = 22/5

Thus the solution of the system of equation is (x, y) = (-1/15, 22/5).

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Answer:

Step-by-step explanation:

To determine how long it would take Anita and Chao to clean a pool together, we can use the concept of work rates.

Anita can clean a pool in 8 hours, so her work rate is 1/8 of a pool per hour.

Chao can clean a pool in 6 hours, so his work rate is 1/6 of a pool per hour.

To find their combined work rate, we add their individual work rates:

1/8 + 1/6 = 3/24 + 4/24 = 7/24

Their combined work rate is 7/24 of a pool per hour.

To determine how long it would take them to clean a pool together, we can set up the equation:

(7/24) * T = 1

Where T represents the time it takes them together to clean the pool.

To solve for T, we multiply both sides of the equation by the reciprocal of (7/24), which is (24/7):

T = (1) * (24/7) = 24/7

Therefore, it would take Anita and Chao working together approximately 24/7 hours to clean a typical pool.

98.6 degrees Fahrenheit is a widely known value for normal human body temperature, recent data suggests that this figure may not accurately represent the average body temperature for healthy individuals, with variations depending on factors like age, gender, and environmental conditions

Normal human body temperature, commonly taught as 98.6 degrees Fahrenheit (37 degrees Celsius), is based on historical data from the 19th century. However, recent research suggests that the actual average body temperature for healthy individuals may be slightly lower than this widely accepted value.
Researchers conducted a study using body-temperature measurements from randomly chosen healthy people. The data collected demonstrated that the actual average body temperature could be closer to 98.2 degrees Fahrenheit (36.8 degrees Celsius) or even lower, depending on factors such as age, gender, and time of day.
These findings support the notion that 98.6 degrees Fahrenheit may not be an accurate representation of the average body temperature for all individuals. Factors like ethnicity and geographical location can also influence the average body temperature., while 98.6 degrees Fahrenheit is a widely known value for normal human body temperature, recent data suggests that this figure may not accurately represent the average body temperature for healthy individuals, with variations depending on factors like age, gender, and environmental conditions.

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The blanks when completed are

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

The dataset

By the definition of null and alternate hypotheses, we have

μ = 98.6 is the null hypothesis

μ ≠ 98.6 is the alternate hypothesis

Using a graphing tool, we have the following:

This means that the standard deviation is

s = 0.680

Also, we have

n = 69

Next, we have

df = n - 1

So, we have

df = 69 - 1

df = 68

To calculate the t-statistic, we use:

t = (x - μ) / (s / √(n))

So, we have

t = (98.546 - 98.6) / (0.680 / √(69))

Evaluate

t = -0.65

The absolute value of the t-value (0.65) is greater than the critical value (0.05).

So, we reject the null hypothesis

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Question

Normal human body temperature, as kids are taught in North America, is 98.6 degrees F. But how well is this supported by data? Researchers obtained body-temperature measurements on randomly chosen healthy people.

μ = 98.6 is the ____ hypothesis

μ ≠ 98.6 is the ____ hypothesis

s = ____

n =

df = ____

t = _______

Can we reject the null hypothesis? (enter yes or no for your answer)

The possible values of ∠H in the triangle ΔHIJ are 18.38° and 161.62° to the nearest tenth of a degree.

Given:In ΔHIJ, h = 9.2 inches, j = 9 inches, and ∠J = 19°.

We need to find all possible values of ∠H, to the nearest 10th of a degree

Solution:

Angle sum property of triangle states that the sum of interior angles of a triangle is 180°.

Let ∠H = xBy applying the angle sum property of the triangle, we get

∠H + ∠I + ∠J = 180°

⇒ x + ∠I + 19° = 180°

⇒ ∠I = 180° - x - 19°

⇒ ∠I = 161° - x

Using the sine rule, we get

sin x/sin 19° = h/jsin x/sin 19°

= 9.2/9sin x

= sin 19° × 9.2/9sin x

= 0.3184x

= sin⁻¹ 0.3184

∴ x = 18.38° or

x = 161.62°

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Based on the equation, the total value of the bill is Q75.00.

Total contribution - Total bill = Shortage

125 * Number of people - X = 50

Total contribution - Total bill = Surplus

150 * Number of people - X = 75

We now have a system of two equations with two variables. Let's solve it to find the value of the total bill (X).

Equation 1: 125 * Number of people - X = 50

Equation 2: 150 * Number of people - X = 75

We can rearrange Equation 1 to solve for X:

X = 125 * Number of people - 50

Substituting this expression for X into Equation 2, we get:

150 * Number of people - (125 * Number of people - 50) = 75

Simplifying the equation:

150 * Number of people - 125 * Number of people + 50 = 75

25 * Number of people + 50 = 75

25 * Number of people = 25

Number of people = 1

Substituting the value of the number of people into Equation 1 to find X:

X = 125 * 1 - 50

X = 125 - 50

X = 75

Therefore, the total value of the bill is Q75.00.

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A group of friends have dinner at a restaurant and decide to share the value of the bill in equal parts. If each one contributes Q125.00, Q50.00 is missing to pay the account, but if each one contributes Q150.00, then Q75.00 is left over. Which account value?