I do Brainliest just pls help me

The accountant's claim is: the proportion of tax filers that receive a refund is less than 25%. The Option B is correct.

The accountant's claim is based on their belief that the upcoming tax year will have a smaller proportion of tax refunds than the proportion from the previous year.

To test the claim, the accountant samples few of their clients and determines that proportion of clients receiving refund for the upcoming tax year is 19%.

This sample proportion of 19% is lower than the proportion of 25% from the previous year which supports the accountant's claim that the proportion of tax filers receiving a refund is less than 25%.

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Answer: (3, -3)

Step-by-step explanation:

2x = 4y + 18 => 2x - 4y = 18   (1)

-5x - 6y = 3   (2)

Multiply both (1) by 5, and (2) by -2

10x - 20y = 90   (3)

10x + 12y = -6    (4)

(3)-(4):

-32y = 96

y = -3

x = 3

The number of intersections of the graphs of the given equations is 0.

To determine the number of intersections of the graphs of the equations:

1. One-halfx + 5y = 6

2. 3x - 30y = 36

We can convert the equations to slope-intercept form (y = mx + b) by isolating y:

1. \(\frac12\\\)x + 5y = 6

  5y = -\(\frac12\\\)x + 6

  y = (-1/10)x + 6/5

2. 3x - 30y = 36

  -30y = -3x + 36

  y = (1/10)x - 36/30

  y = (1/10)x - 6/5

Now, we can observe that both equations have the same slope, which is 1/10, but they have different y-intercepts (6/5 and -6/5).

Since the slopes are the same but the y-intercepts are different, the two lines are parallel.

Parallel lines do not intersect,

so the graphs of these equations have no intersection points.

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Answer:

A or none

Step-by-step explanation:

edge

Option B is the correct answer: It shows that H is closed under scalar multiplication, which is all that is required for a subset to be a vector space.

To elaborate, a subspace of a vector space R must meet three conditions:
1. The zero vector is included in the subspace.
2. The subspace is closed under vector addition.
3. The subspace is closed under scalar multiplication.

In this case, H consists of vectors of the form tv, where v = (0, -5) and t is any scalar. The zero vector is included when t = 0, which gives (0, 0). For scalar multiplication, any vector in H multiplied by a scalar will still be in H. For example, if t1 and t2 are scalars, then (t1 * t2)v = t1(t2v), and since t1(t2v) is still a scalar multiple of v, it remains in H. This shows that H is a subspace of R³ as it meets the necessary conditions.

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Answer:

1. m = 5    2. v = -19    3.  x = 10

4. x = 3     5. x = 32     6. x = -50

Step-by-step explanation:

My mom told me I know everything :D

The 95% confidence interval for the true mean cholesterol content of all eggs is (216.77, 233.23) milligrams.

To construct a confidence interval for the true mean cholesterol content of all eggs, we can use the formula:

Confidence Interval = mean ± (critical value) * (standard deviation / sqrt(sample size))

Given that the sample mean is 225 milligrams (mean), the standard deviation is 15.7 milligrams (s), and the sample size is 12 eggs, we need to determine the critical value for a 95% confidence level.

Since the sample size is small (n < 30) and the population standard deviation is unknown, we use a t-distribution. With a 95% confidence level and 12 degrees of freedom (sample size minus 1), the critical value can be found using statistical tables or software, which is approximately 2.201.

Plugging in the values into the confidence interval formula:

Confidence Interval = 225 ± (2.201) * (15.7 /  √(12))

                  = 225 ± (2.201) * (15.7 / 3.464)

                  ≈ 225 ± (2.201) * 4.529

                  ≈ 225 ± 9.972

                  ≈ (215.03, 234.97)

Therefore, we can be 95% confident that the true mean cholesterol content of all eggs lies within the interval of (216.77, 233.23) milligrams.

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The right alternative to replace the question mark (?) is nik.

The given series is wfb, tgd, qhg. To find the right alternative to replace the question mark (?), we need to identify the pattern in the series.

Looking at the series, we can observe that the first letter in each term is moving back two steps in alphabetical order, while the second letter is moving forward one step, and the third letter is moving forward one step and then moving forward two steps which means that it is moving forward with "n+1" steps where n = 0, 1, 2, 3,...

Applying this, we can determine the next term in the series:

w → t → q → n

f → g → h → i

b → d → g → k

So, the next term comes to be "nik"

Therefore, the right alternative to replace the question mark (?) is "nik".

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Answer:

(1)7 (2)9 (3)6

Step-by-step explanation:

\(\left|\begin{array}{c|cc}X&f(X)=X^2+7\\--&-----\\2&11\\3&16\\4&23\\5&32\\6&43\end{array}\right|\)

(1)The average rate of change between x=2 and x=5

\(\dfrac{dy}{dx} =\dfrac{f(5)-f(2)}{5-2} =\dfrac{32-11}{3} =\dfrac{21}{3} =7\)

(2)The average rate of change between x=3 and x=6

\(\dfrac{dy}{dx} =\dfrac{f(6)-f(3)}{6-3} =\dfrac{43-16}{3} =\dfrac{27}{3} =9\)

(3)The average rate of change between x=2 and x=4

\(\dfrac{dy}{dx} =\dfrac{f(4)-f(2)}{4-2} =\dfrac{23-11}{2} =\dfrac{12}{2} =6\)

Answer:

2 .   4 .  8 .  

Step-by-step explanation:

increases

There are 846720 different values possible for the sum of xyx and yxy.

Let's denote the three digits of xyx as a, b, and c, such that xyx = 100a + 10b + c, and the three digits of yxy as d, e, and f, such that yxy = 100d + 10e + f. Note that x and y are distinct non-zero digits, so a, b, c, d, e, and f are all distinct non-zero digits.

The sum of xyx and yxy is (100a + 10b + c) + (100d + 10e + f), which simplifies to 100(a+d) + 20(b+e) + (c+f).

We want to find how many different values are possible for the sum. Since a, b, c, d, e, and f are all distinct non-zero digits, we can consider each of them separately.

For a given value of a, there are 9 choices for d (since d cannot be equal to a), and once we have chosen d, there are 8 choices for e (since e cannot be equal to either a or d). Similarly, there are 7 choices for f (since f cannot be equal to a, d, or e).

So, for a fixed value of a, the number of possible values of the sum is the number of possible values of (100(a+d) + 20(b+e) + (c+f)), which is simply the number of possible values of (20(b+e) + (c+f)), since 100(a+d) is fixed.

There are 8 choices for b (since b cannot be equal to a), and once we have chosen b, there are 7 choices for c (since c cannot be equal to either a or b). Similarly, there are 6 choices for e (since e cannot be equal to either a, d, or b), and 5 choices for f (since f cannot be equal to either a, d, e, or c).

Therefore, the total number of possible values of the sum is:

9 × 8 × 7 × 8 × 7 × 6 × 5 = 846720

Therefore, there are 846720 different values possible for the sum of xyx and yxy.

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Answer:

32n = 100 - 20

n = 2.5

he purchased 2 sweaters

Step-by-step explanation:

32n = 100 - 20

If Favian originally had $100 but spent $20 on a belt, he only had 80 left, meaning that 80 = 32n which means that he was able to but 2 sweaters and got $16 back. Therefore the formula would be 32n = 100 - 20

The formula for the number of sweaters will be 32n = 100 – 20.

A linear system is one in which the parameter in the equation has a degree of one. It might have one, two, or even more variables.

Favian received a $100 gift card to a clothing store.

Using only the gift card, he was able to purchase n sweaters that cost $32 each and 1 belt for $20.

If there was no tax on the sweaters and belt,

Then the equation will be

32n + 1 x 20 = 100

    32n + 20 = 100

             32n = 80

                 n = 2.5 ≈ 2

If Favian originally had $100 but spent $20 on a belt, he only had 80 left, meaning that 80 = 32n, which means that he was able to but 2 sweaters and got $16 back.

Therefore, the formula would be 32n = 100 – 20.

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Dilation involves changing the size of a shape (i.e. a circle)

The scale of dilation is 4

The circle passes through the origin.

So, one of the points is (0,0)

When dilated it passes through the point (4,0).

The scale factor (k) is calculated by calculating the distance between the new point and the old point.

So, we have:

\(\mathbf{k = \sqrt{(x_2 - x_1)^2 + (y_2 -y_1)^2}}\)

This gives

\(\mathbf{k = \sqrt{(4- 0)^2 + (0-0)^2}}\)

Simplify

\(\mathbf{k = \sqrt{16 +0}}\)

Add 16 and 0

\(\mathbf{k = \sqrt{16}}\)

Take the square root of 16

\(\mathbf{k =4}\)

Hence, the scale of dilation is 4

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£36

20+25=45          Take away 13 and it's 32.   32+4 (the shipping charge) is 36. So Ruth pays 36 pounds.

If the coefficient of determination is a  positive value, then the coefficient of correlation can be either negative or positive.

What is coefficient of correlation & coefficient of determination ?

The correlation coefficient is a statistical measure of the strength of a two-variable linear relationship. it has possible values between -1 to 1. it is denoted by 'r'.

The coefficient of determination is a statistic that describes the amount of variability in one component that can be explained by its relationship to another. This association of "goodness of fit" is expressed as a number between 0.0 and 1.0. It is represented by the symbol 'r2'.

The square of the coefficient of determination is the coefficient of correlation.

\(r^{2} = positive \\where\)\(r\)  = ±

If the coefficient of determination is a positive value, then the coefficient of correlation can be either negative or positive.

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Answer:

y=60x

Step-by-step explanation:

Answer:

Hello! Your answer would be, A)The sum of the perimeters of the squares draw off each leg is equal to the perimeter of the square drawn off the hypotenuse.

Step-by-step explanation:

Hope I helped! Brainiest plz!♥ Have a nice morning! Hope you make a 100%! -Amelia

To determine the percentage of scores that fall between 52 and 62, we can calculate the z-scores for these values and use the standard normal distribution table or a statistical calculator.

First, we calculate the z-score for 52 using the formula:

z = (x - μ) / σ

where x is the value (52), μ is the mean (48), and σ is the standard deviation (7).

z = (52 - 48) / 7

z = 4 / 7

z ≈ 0.57

Next, we calculate the z-score for 62:

z = (62 - 48) / 7

z = 14 / 7

z = 2

Now, we can use the standard normal distribution table or a statistical calculator to find the percentage of scores between these z-scores.

Using the standard normal distribution table, we can look up the area/probability corresponding to each z-score.

For z = 0.57, the area/probability is approximately 0.7123.

For z = 2, the area/probability is approximately 0.9772.

To find the percentage between these two z-scores, we subtract the area/probability corresponding to the lower z-score from the area/probability corresponding to the higher z-score:

Percentage = (0.9772 - 0.7123) * 100

Percentage ≈ 26.49

Therefore, approximately 26.49% of scores fall between 52 and 62. Since none of the given answer choices match this value, it appears that the provided answer choices do not include the correct option.

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The part of the figure marked ? is solved to be

113 degrees

The part of the circle marked by a question mark is solved using the relation as shown below

given angle formed by the tangents = 180 degrees - minor arc GE

information given in the problem includes

given angle formed by the tangents = 67 degrees

minor arc GE = ?

plugging in these values results to

67 degrees = 180 degrees - ?

rearranging the equation

? = 180 degrees - 67

? = 113

hence the required side is 113 degrees

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Answer:

36 people

Step-by-step explanation:

240 x 0.15 = 36

Answer:

I believe the answer is B

Answer:

10.6

Step-by-step explanation:

Pythagorean theorem: a² + b² = c²

Where a and b = the legs and c = hypotenuse

We are given two legs and need to find the hypotenuse

Given:

Short leg (a) = 7

Long leg (b) = 8

Hypotenuse = c

Now to find the value of c we simply plug in the values of the variables into the Pythagorean theorem and solve for c

Pythagorean theorem: a² + b² = c²

a = 7, b = 8, c = c

Plug in values

7² + 8² = c²

Now solve for c

Simplify exponents

49 + 64 = c²

Add

113 = c²

Taking the square root of both sides

c = 10.6 ( rounded to the nearest tenth )

Answer:

c = 10.6

Step-by-step explanation:

\(h {}^{2} = p {}^{2} + b {}^{2} \\ c {}^{2} = (8) {}^{2} + (7) {}^{2} \\ c = \sqrt{64 + 49} \\ c = \sqrt{113} \\c = 10.6\)

the antiderivative of the function f(x) = 2 csc(x) cot(x) sec(x) tan(x) is F(x) = 2x + C.

To find the antiderivative F(x) of the function f(x) = 2 csc(x) cot(x) sec(x) tan(x), we can simplify the expression and integrate each term individually.

We know that csc(x) = 1/sin(x), cot(x) = 1/tan(x), sec(x) = 1/cos(x), and tan(x) = sin(x)/cos(x).

Substituting these values into the expression:

f(x) = 2 * (1/sin(x)) * (1/tan(x)) * (1/cos(x)) * (sin(x)/cos(x))

= 2 * (1/sin(x)) * (1/(sin(x)/cos(x))) * (sin(x)/cos(x)) * (sin(x)/cos(x))

= 2 * (1/sin(x)) * (cos(x)/sin(x)) * (sin(x)/cos(x)) * (sin(x)/cos(x))

= 2 * 1

= 2

The antiderivative of a constant function is simply the constant multiplied by x. Therefore:

F(x) = 2x + C

where C represents the constant of the antiderivative.

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Table B correctly represents the ratio of students to adult

Ratio is an ordered pair of numbers x and y, which can written in form x/ y where y is not 0.

For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is 8 :6 Similarly, the ratio of lemons to oranges is 6:8

ratio 48:6= 48/6

= 8

this means that 8 student to 1 adult

in table B all ratio of student to adult is 8:1

therefore only table 2 obeys this ratio

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If you don't know, you can just search it up.

1 liter equals 2.11338 pints, meaning a liter is more.

Debra drinks more milk.

But holy duck?!?!?! That's a WHOLE LOTTA MILK MAN.

9514 1404 393

Answer:

  Debra

Step-by-step explanation:

A pint is about 0.473 liters, so Debra drinks more.

2 Hours

this is because one pipe takes 4 hours, and if both pipes take 2 hours, that is cutting the time in half, meaning both pipes pour the same amount and take the same time.

hope this is helpful!

Using Gauss-Jordan elimination, the system of equations is reduced to a form where x₁ and x₂ are pivot variables, and x₃ is a free variable. Thus, the system has infinitely many solutions with x₁ = s, x₂ = t, and x₃ = t.

To solve the system of equations using Gauss-Jordan elimination, we can write the augmented matrix:[4  -7  -5  |  34]

[1  -3   0  |  11]

First, let's perform row operations to simplify the matrix. R2 = R2 - (1/4)R1

R1 = R1/4

The matrix becomes:[1   -7/4  -5/4  |  34/4]

[0   -5/4  5/4   |  11 - (1/4)*34]

Next, we can simplify further:[1   -7/4   -5/4   |   17/2]

[0    1     -1     |  (11 - 34/4)*4/5]

Continuing with row operations:R1 = R1 + (7/4)R2

The matrix simplifies to:[1   0   -9/4   |  17/2 + (7/4)(11 - 34/4)*4/5]

[0   1    -1    |  (11 - 34/4)*4/5]

Simplifying further:[1   0   -9/4   |  73/10]

[0   1   -1     |  33/10]

From the augmented matrix, we can see that both x₁ and x₂ are pivot variables, while x₃ is a free variable. Thus, the system has infinitely many solutions.

Therefore, the correct choice is C: The system has infinitely many solutions. The solution is x₁ = s, x₂ = t, and x₃ = t.

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Answer:

Appropriate weight gain for a pregnant woman with a BMI of 17 is 28-40 pounds. Appropriate weight gain for a pregnant woman with a BMI of 32 is 11-20 pounds.

Step-by-step explanation:

The work required to pump all the oil to the surface is 4.87 million ft-lb.  

The fuel oil tank is an upright cylinder with a circular top 12 feet below ground level.

Its dimensions are a radius of 6 feet and a height of 18 feet, with a current oil level of only 14 feet deep.

Calculate the work necessary to pump all of the oil to the surface, given that oil has a weight of 50 lb/ft³.

Work is equal to the force multiplied by the distance moved by the object along the force's direction (W = Fd).

The force is equal to the mass multiplied by the gravitational field strength (F = mg).

The mass is equal to the density multiplied by the volume (m = ρV).

Let's first calculate the volume of oil contained in the tank.

V = πr²h = π(6²)(14) = 504π cubic feet, where V is the volume, r is the radius, and h is the height.

Substituting the density of oil and the volume of oil into the mass equation, we get

m = ρV = (50 lb/ft³) (504π ft³) = 25200π lb

Next, calculate the weight of the oil.F = mg = (25200π lb) (32.2 ft/s²) = 811440 lb.

Substituting the force and the distance into the work formula, we get the work required.

W = Fd = (811440 lb) (12 ft) = 9737280 ft-lb = 4.87 million ft-lb (rounded to two decimal places).

The work required to pump all the oil to the surface is 4.87 million ft-lb.  

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The sampling method commonly used for a life-work balance survey is probability sampling, specifically stratified random sampling. This approach involves dividing the target population into different strata or categories based on relevant characteristics (e.g., age, gender, occupation).

Limitations associated with this sampling method include:

1. Non-response bias: There is a possibility that not all selected individuals will participate in the survey, leading to non-response bias. Those who choose not to participate may have different perceptions of life-work balance, which can affect the generalizability of the findings.

2. Sampling error: Probability sampling aims to reduce sampling error by providing a representative sample of the population. However, there is still a chance that the selected sample may not perfectly reflect the entire population, resulting in sampling error. The extent of sampling error can be quantified using measures such as confidence intervals.

3. Limited generalizability: While probability sampling provides a more representative sample, the findings may still have limited generalizability to populations with different characteristics or contexts. It is important to consider the specific characteristics of the sample and the context in which the survey was conducted when interpreting and applying the results.

4. Cost and time constraints: Probability sampling can be time-consuming and expensive, especially when the target population is large or geographically dispersed. Practical constraints may limit the ability to survey a truly representative sample, and compromises may need to be made.

Overall, while probability sampling is a widely accepted method for achieving representative samples in surveys, it is essential to acknowledge and consider its limitations to ensure accurate interpretation and application of the survey findings.

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