STATS HELP PLEASE

Suppose a normal distribution has a mean of 120 and a standard deviation of
10. What is P(x>110)?
A. 0.475
B. 0.16
C. 0.975
OD. 0.84

The coordinates of point K can be given by (-1/4, 5/8).

What are cartesian coordinates?

Cartesian coordinates are the values on a graph that can be used to show the location of a point on the graph.

The coordinates of point K can be found as follows:

There are 4 lines between 0 and -1 on the x-axis which divide it into 4 equal parts.

Point K lies on the first line. This means that the x-coordinate of the point is -1/4.

There are 8 lines between 0 and 1 on the y-axis which divide it into 8 equal parts.

Point K lies on the fifth line. This means that the y-coordinate of the point is 5/8.

From this, we can understand that the coordinates of the point K on the graph can be given by (-1/4, 5/8).

Therefore, the coordinates of point K can be given by (-1/4, 5/8).

To find how many miles Skylar runs, we need to use the information given that Everett runs 1.5 fewer miles than Skylar and that Everett runs 7.64 miles. Let x be the number of miles Skylar runs. Then, we know that x - 1.5 is the number of miles Everett runs.

  We can set up an equation:

x - 1.5 = 7.64

To solve for x, we add 1.5 to both sides:

x = 9.14

Therefore, Skylar runs 9.14 miles.

In summary, to find the number of miles Skylar runs, we can use the fact that Everett runs 1.5 fewer miles than Skylar and that Everett runs 7.64 miles. We can set up an equation and solve for x, which represents the number of miles Skylar runs. The answer is 9.14 miles.

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To find how many miles Skylar runs, we need to use the information given that Everett runs 1.5 fewer miles than Skylar and that Everett runs 7.64 miles. Let x be the number of miles Skylar runs. Then, we know that x - 1.5 is the number of miles Everett runs.

 We can set up an equation:

x - 1.5 = 7.64

To solve for x, we add 1.5 to both sides:

x = 9.14

Therefore, Skylar runs 9.14 miles.

In summary, to find the number of miles Skylar runs, we can use the fact that Everett runs 1.5 fewer miles than Skylar and that Everett runs 7.64 miles. We can set up an equation and solve for x, which represents the number of miles Skylar runs. The answer is 9.14 miles.

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There is no significance difference in the variation in the listening times for men and women.

In this study conducted by Arbitron Media Research Incorporated, the iPod listening habits of men and women were examined. One aspect of the study focused on the mean listening time for both genders. The objective is to determine if there is a significant difference in the variation of listening times between men and women. To do so, statistical analysis will be conducted using the given data.

To determine if there is a significant difference in the variation of listening times between men and women, we can perform a hypothesis test. Let's denote the mean listening time for men as μ₁, the mean listening time for women as μ₂, the standard deviation for men as σ1, and the standard deviation for women as σ₂.

Null Hypothesis (H₀): There is no difference in the variation of listening times between men and women. In mathematical terms, H₀ : σ₁ = σ₂.

Alternative Hypothesis (H₁): There is a difference in the variation of listening times between men and women. In mathematical terms, H₁ : σ₁ ≠ σ₂.

We will use a significance level of 0.10, which indicates that we are willing to accept a 10% chance of rejecting the null hypothesis when it is true.

To test this hypothesis, we can use the F-test for comparing variances. The F-test compares the ratio of the variances between two independent samples. In this case, the samples are the listening times of men and women. The F-test statistic is calculated as follows:

F = (s₁²) / (s₂²)

where s₁ and s₂ are the sample variances. In this case, the sample variances are the square of the standard deviations provided.

Let's calculate the F-test statistic using the given data:

For men:

Sample size (n₁) = 8

Sample standard deviation (s₁) = 12 minutes/day

Sample variance (s₁²) = (12²) = 144 minutes²/day²

For women:

Sample size (n₂) = 10

Sample standard deviation (s₂) = 16 minutes/day

Sample variance (s₂²) = (16²) = 256 minutes²/day²

Calculating the F-test statistic:

F = (s₁²) / (s₂²) = 144 / 256 ≈ 0.5625

Next, we need to determine the critical value for the F-test statistic at a significance level of 0.10. This critical value can be found in the F-distribution table. Since the sample size is small, we will use the F-distribution table.

With a sample size of 8 for men and 10 for women, the degrees of freedom for the numerator (df₁) is 7 (n₁ - 1) and the degrees of freedom for the denominator (df₂) is 9 (n₂ - 1).

Looking up the critical value from the F-distribution table with df₁ = 7 and df₂ = 9, at a significance level of 0.10, we find the critical value to be approximately 2.76.

Now, we compare the calculated F-test statistic with the critical value. If the calculated F-test statistic is greater than the critical value, we reject the null hypothesis; otherwise, we fail to reject the null hypothesis.

In this case, the calculated F-test statistic (0.5625) is less than the critical value (2.76). Therefore, we fail to reject the null hypothesis. This means that there is no enough evidence to conclude that there is a significant difference in the variation of listening times between men and women at the 0.10 significance level.

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To find the maximum value of a and the minimum value of b, we need to solve the equation 9+9x-x²-x³ = k for x and then determine the range of values for k where the equation has only one solution.

First, we can rearrange the equation to get:

x³ + x² - 9x - (k - 9) = 0

We can then use the rational root theorem to find the possible rational roots of this polynomial equation. The possible rational roots are of the form p/q, where p is a factor of the constant term (k - 9) and q is a factor of the leading coefficient (1). The factors of (k - 9) are ±1, ±3, ±(k-9), and the factors of 1 are ±1. So the possible rational roots are:

±1, ±3, ±(k-9), ±(k-9)/3

We can test each of these possible roots by plugging them into the equation and checking if the result is zero. After testing each possible root, we find that the only root that works is x = 3. Therefore, the equation has only one solution when x = 3.

To determine the range of values for k where the equation has only one solution, we can substitute x = 3 into the equation:

9 + 9(3) - 3² - 3³ = k

Simplifying this, we get:

k = -9

So the equation has only one solution when k = -9. Now, we need to find the maximum value of a and the minimum value of b for this value of k.

For k < -9, the equation has no real solutions, since the equation is a cubic polynomial with a negative leading coefficient, which means it has a local maximum and a local minimum. Therefore, the maximum value of a is -9.

For k > -9, the equation has three real solutions, since the equation is a cubic polynomial with a negative leading coefficient, which means it has a local maximum and a local minimum, and crosses the x-axis three times. Therefore, the minimum value of b is -9.

So the maximum value of a is -9 and the minimum value of b is -9.

If you choose the lottery, you would be considered a risk taker.

By opting for the lottery with a 0.50 probability of winning $500 and a 0.50 probability of winning nothing, you are demonstrating a willingness to take a chance and accept the uncertainty associated with the potential outcomes. A risk taker is someone who is willing to engage in risky or uncertain situations for the possibility of gaining a favorable outcome. In this case, you are accepting the risk of potentially winning nothing in exchange for the chance to win a larger amount.

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Answer:

√y = ¼ x² + 2

y = (¼ x² + 2)²

Step-by-step explanation:

dy / dx = x √y

Separate the variables:

dy / √y = x dx

Change radical to exponent:

y^-½ dy = x dx

Integrate both sides using power rule:

2 y^½ = ½ x² + C

2√y = ½ x² + C

Substitute initial condition:

2√9 = ½ (2)² + C

6 = 2 + C

C = 4

Therefore:

2√y = ½ x² + 4

√y = ¼ x² + 2

y = (¼ x² + 2)²

Answer:

(a) yes

(b) yes

(c) yes

(d) yes

(e) no

(f) no--2x - 1 > 2x, so -1 > 0 (not true)

The volume of the display case is 2161 1/8 cubic inches.To find the volume of a rectangular prism-shaped display case, we multiply its length, width, and height.

Given that the display case is 30 1/2 inches wide, 10 1/2 inches long, and 32 1/4 inches tall, we can calculate the volume as follows:

Volume = Length * Width * Height

Using the given measurements:

Volume = 10 1/2 inches * 30 1/2 inches * 32 1/4 inches

To simplify the calculation, we can convert the mixed numbers to improper fractions:

Volume = (21/2) inches * (61/2) inches * (129/4) inches

Next, we multiply the fractions:

Volume = (21/2) * (61/2) * (129/4) = 17289/8

The resulting fraction, 17289/8, is an improper fraction. To convert it back to mixed number form:

Volume = 2161 1/8 in³.

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Answer:

x(a-b-c)+y(-a+b-c)

Step-by-step explanation:

For a balloon mortgage, the monthly payments are usually lower, but there is a final "balloon" payment due at the end of the term.

a. Property Taxes:

The assessed value of the building is $500,000, and the property tax rate is 2.415%. To calculate the property taxes, we multiply the assessed value by the tax rate:

Property taxes = Assessed value * Tax rate

Property taxes = $500,000 * 2.415% (convert percentage to decimal)

Property taxes = $500,000 * 0.02415

Property taxes = $12,075

Therefore, the property taxes on the assessed value of the building will be $12,075.

b. Monthly Mortgage Payment:

To calculate the monthly mortgage payment, we need to consider the loan amount, interest rate, and loan term. The down payment is 20%, so the loan amount will be 80% of the market value of the building:

Loan amount = Market value * (1 - Down payment percentage)

Loan amount = $457,350 * (1 - 20%) (convert percentage to decimal)

Loan amount = $457,350 * 0.8

Loan amount = $365,880

We can now use this loan amount, along with the mortgage interest rate and loan term, to calculate the monthly payment using the formula for a fixed-rate mortgage:

Monthly payment = (Loan amount * Monthly interest rate) / (1 - (1 + Monthly interest rate)^(-Total number of months))

The monthly interest rate is the annual interest rate divided by 12, and the total number of months is the loan term multiplied by 12.

Annual interest rate = 4.55% (convert percentage to decimal)

Monthly interest rate = 4.55% / 12

Loan term = 30 years

Total number of months = 30 * 12

Now, let's calculate the monthly payment:

Monthly payment = ($365,880 * Monthly interest rate) / (1 - (1 + Monthly interest rate)^(-Total number of months))

c. Total Interest Paid:

To calculate the total interest paid over the life of the loan, we multiply the monthly payment by the total number of months and subtract the loan amount:

Total interest paid = (Monthly payment * Total number of months) - Loan amount

d. Closing Costs:

The closing costs can vary, but a common range is between 2% and 5% of the purchase price. To calculate the range for closing costs, we'll use these percentages:

Minimum closing costs = Purchase price * 2%

Maximum closing costs = Purchase price * 5%

e. Balloon Mortgage Payment:

For a balloon mortgage, the monthly payments are usually lower, but there is a final "balloon" payment due at the end of the term. To calculate the monthly payment for the balloon mortgage, we'll use the loan amount, interest rate, and loan term:

Monthly payment = (Loan amount * Monthly interest rate) / (1 - (1 + Monthly interest rate)^(-Total number of months))

Now, let's calculate the monthly payment for the balloon mortgage.

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(a) The system of equations that models the situation is:

x + y = 24

y = 2x + 3

(b) Juliet spends 7 hours coaching lacrosse and 17 hours coaching field hockey each day.

To model the situation, we can define the following variables:

Let x be the number of hours Juliet coaches lacrosse.

Let y be the number of hours Juliet coaches field hockey.

From the given information, we can create a system of equations:

The total coaching hours: x + y = 24

The field hockey practice duration: y = 2x + 3

To determine how many hours Juliet spends coaching each sport, we can solve the system of equations.

First, we'll substitute the value of y from equation 2 into equation 1:

x + (2x + 3) = 24

3x + 3 = 24

3x = 21

x = 7

Now, we can substitute the value of x back into equation 2 to find y:

y = 2(7) + 3

y = 14 + 3

y = 17

Juliet spends 7 hours coaching lacrosse and 17 hours coaching field hockey each day.

To verify our solution, we can check if the total coaching hours add up to 24:

7 + 17 = 24

The sum is indeed 24, confirming that our solution is correct.

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The expression sinθcosec is equivalent to 1 wherever it is defined, since cosecθ is the reciprocal of sinθ. Therefore, none of the given options are correct.

The expression sinθcosec is equivalent to 1 wherever it is defined, not any of the given options. To show this, recall that cosecθ is defined as the reciprocal of sinθ, i.e., cosecθ = 1/sinθ. Therefore, sinθcosec = sinθ(1/sinθ) = 1, whenever sinθ is not equal to 0 (since division by 0 is undefined).

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Answer:

44 yd^2

Step-by-step explanation:

Area of trapezium = ½ x (sum of the lengths of the parallel sides) x perpendicular distance between parallel sides

= 1/2 (12 + 5.6) × 5

= 44yd^2

the probability of picking a pitcher from the remaining cards is still 7/24. The probability that the next card Leslie looks at will be a pitcher is 7/24.

Leslie randomly looked at 24 cards out of 300, and she saw that 7 of them were pitchers. So, the probability of picking a pitcher from those 24 cards is 7/24. Since the remaining cards are still part of the same deck, and Leslie did not replace any of the cards she looked at, the probability of picking a pitcher from the remaining cards is still 7/24. Therefore, the probability that the next card Leslie looks at will be a pitcher is 7/24.

Step 1: Determine the total number of cards Leslie looked at, which is 24 (8 outfielders + 7 pitchers + 4 catchers + 5 infielders).
Step 2: Identify the number of pitchers, which is 7.
Step 3: Calculate the probability of picking a pitcher by dividing the number of pitchers by the total number of cards: 7 pitchers / 24 cards = 0.2917, or 29.17% when expressed as a percentage.

So, based on the data, the probability that the next card Leslie looks at will be a pitcher is approximately 29.17%.

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Answer:

-16r^2 - 10r

Step-by-step explanation:

To simplify the expression -2r(8r+5), you can use the distributive property of multiplication over addition.

-2r(8r+5) = -2r * 8r - 2r * 5

First, let's simplify -2r * 8r:

-2r * 8r = -16r^2

Next, let's simplify -2r * 5:

-2r * 5 = -10r

Putting it all together, the simplified expression is:

-2r(8r+5) = -16r^2 - 10r

Answer:

m∠B = 11°

Step-by-step explanation:

When two angles are complementary, the sum of the measures equals 90° (the two angles form a right angle together)

Step 1:  Therefore, we can find x by making the sum of the measures of angles A and B equal to 90:

m∠A + m∠B = 90

4x - 13 + x - 12 = 90

5x - 26 = 90

5x = 115

x = 23

Step 2:  Now, we can plug in 23 for x in the equation representing m∠B:

m∠B = x - 12

m∠B = 23 - 12

m∠B = 11°

Other Examples:  There are many ways to have two complementary angles, where none of the two angles are 0 or 90, including (1° + 89°), (2° + 88°) (3° + 87°), ..., (44° + 46°)

Let's say that m∠X = 1° and m∠R = 89°.  The two angles are complementary since 1 + 89 = 90°

#4: The transformation can be represented by (x, y - 8).

By calculating the residuals (e_i) for each observation in the dataset and minimizing their sum of squares, we can estimate the regression coefficients (b_0, b_1, b_2) using various regression techniques such as ordinary least squares.

To calculate the residual score for the dependent variable y in the regression equation, we need to subtract the predicted value of y from the actual observed value of y. The regression equation with subscripts to calculate the residual score for y is:

e_i = y_i - (b_0 + b_1 * x_1i + b_2 * x_2i)

where:

e_i is the residual score for the i-th observation of y,

y_i is the actual observed value of y for the i-th observation,

b_0 is the intercept coefficient,

b_1 is the coefficient for the first independent variable x_1,

x_1i is the value of the first independent variable for the i-th observation,

b_2 is the coefficient for the second independent variable x_2,

x_2i is the value of the second independent variable for the i-th observation.

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To convert other bases to base ten in binary​, we multiply the base to the exponent of the position of the number and take the sum

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

Numbers in other bases to base ten

To do this we use the product rule

Take for instance, we want to convert the binary number 1011 to base ten.

This means that we are converting from base 2 to base 10

Using the above as a guide, we have the following:

1011₂ = 1 * 2³ + 0 * 2² + 1 * 2¹ + 1 * 2⁰

Evaluate

1011₂ = 13

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The drop-outs thinks learning real skills would have provided them with better opportunities for employment and financial stability.

The high school dropouts express the sentiment that if they had been given the opportunity to learn practical skills that could directly contribute to their ability to earn a living, they would have chosen to stay in school.

This belief stems from the understanding that possessing tangible skills valued by employers increases their chances of securing gainful employment and achieving financial independence. By focusing on real-world skills, they feel they would have been better prepared for the job market and able to navigate the challenges of adulthood with greater ease.

Full question "Eighty percent of students who dropped out of high school said that they would have stayed in school if they had the opportunity to learn real skills that would help them earn a living. Why do they say so?"

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Answer:

the solution points for the system of equations are (3, 25) and (-7/2, -7).

Step-by-step explanation:

We can solve this system of equations using substitution or elimination. Here, we will use the substitution method:

Substitute y = 2x^2 + 5x - 10 into the second equation:

4x - (2x^2 + 5x - 10) = -11

Simplifying the left side of the equation:

4x - 2x^2 - 5x + 10 = -11

Rearranging the terms:

2x^2 - x + 21 = 0

Using the quadratic formula:

x = (-(-1) ± sqrt((-1)^2 - 4(2)(21))) / 2(2)

x = (1 ± sqrt(169)) / 4

x = (1 ± 13) / 4

Simplifying:

x = 3 or x = -7/2

Now, substitute each value of x back into one of the original equations to find the corresponding value(s) of y:

For x = 3:

y = 2(3)^2 + 5(3) - 10 = 25

So one solution point is (3, 25).

For x = -7/2:

y = 4(-7/2) + 11 = -7

So the other solution point is (-7/2, -7).

Therefore, the solution points for the system of equations are (3, 25) and (-7/2, -7).

To find the price before the discount, we can use the information given.

Let's assume the original price before the discount is "P."

After a 10% discount, the price becomes $4.50. This means that the discounted price is equal to 90% of the original price:

0.90P = $4.50

To find the original price "P," we divide both sides of the equation by 0.90:

P = $4.50 / 0.90

P = $5.00

Therefore, the price before the discount was $5.00.

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Answer:

To compute the average speed, multiply the total distance travelled by the whole time spent. There's a formula for speed, time and distance

Travel distance aboard the pterodactyl = 10 mph x 3 hours = 30 miles

Distance travelled on the spinosaurus = 2 miles x 1 hour = 2 miles

30 miles + 2 miles = 32 miles total distance travelled

Total time required = 3 hours + 1 hour = 4 hours

Average speed = total distance travelled divided by the total time taken = 32 miles divided by 4 hours = 8 mph

As a result, our average speed is 8 mph.

The simplified expression to represent the total number of boxes of product in the warehouse is 13x + 21x12.

The warehouse has two types of cases: one type containing 13 boxes of product and the other containing 21 boxes of product. Let x be the number of cases containing 13 boxes of product.

Step 1: Identify the terms given in the problem. We have x cases with 13 boxes of product and x cases with 21 boxes of product.
Step 2: Write expressions for each group of cases. For the first group, the expression is 13x. For the second group, the expression is 21x.
Step 3: Add the expressions together to represent the total number of boxes of product. So, the combined expression is 13x + 21x.
Step 4: Simplify the expression by combining like terms. The final simplified expression is 13x + 21x = (13 + 21)x = 34x.

So, the simplified expression representing the total number of boxes of product in the warehouse is 34x.

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The length of AC is given as follows:

AC = 70 units.

The geometric mean theorem states that the length of the altitude of a triangle is equal to the geometric mean of the lengths of the segments formed on the hypotenuse.

The altitude segment for this problem is given as follows:

21.

The bases for this problem are given as follows:

AD and 7.

Hence the length AD is obtained as follows:

7AD = 21² -> Geometric mean definition

AD = 21 x 21/7

AD = 21 x 3

AD = 63.

Applying the segment addition postulate, the length AC is obtained as follows:

AC = AD + DC

AC = 63 + 7

AC = 70 units.

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The points that are on the line given by the equation y = x - 2 include the following:

A. Point A: (4, 2)

B. Point B. (1, -1)

D. Point D. (-2, -4)

In Mathematics and Geometry, the slope-intercept form of the equation of a straight line is given by this mathematical equation;

y = mx + c

Where:

Based on the information provided above, a linear equation that models the situation is given by;

y = mx + c

y = x - 2

When x = -2, the y-value can be determined as follows;

y = -2 - 2

y = -4

Therefore, the ordered pair (-2, 1) does not lie on this equation.

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We can reject the null hypothesis and conclude that there is a significant difference in the average customer satisfaction ratings between Home Depot and Lowe's.

What is hypothesis?

A hypothesis is a proposed explanation or prediction that can be tested through empirical investigation.

To test the difference in the average customer satisfaction rating for Home Depot and Lowe's, we can perform a two-sample t-test. Let's go through the steps of conducting the hypothesis test:

Step 1: State the hypotheses:

Null Hypothesis (H₀): The average customer satisfaction rating for Home Depot is equal to the average customer satisfaction rating for Lowe's.

Alternative Hypothesis (H₁): The average customer satisfaction rating for Home Depot is different from the average customer satisfaction rating for Lowe's.

Step 2: Set the significance level (α):

Let's assume a significance level of α = 0.05. This means we want to have strong evidence to reject the null hypothesis if the p-value is less than 0.05.

Step 3: Collect the data and calculate the sample statistics:

We have the following customer satisfaction ratings:

Home Depot: 79, 81

Lowe's: 72, 78, 79, 76, 72

To calculate the sample statistics, we need to find the sample means and sample standard deviations for Home Depot and Lowe's.

Sample mean of Home Depot [tex](\bar x_1)[/tex] = (79 + 81) / 2 = 80

Sample mean of Lowe's [tex](\bar x_2)[/tex] = (72 + 78 + 79 + 76 + 72) / 5 = 75.4

To calculate the sample standard deviations, we need to find the differences between each rating and the respective sample mean, square the differences, sum them up, divide by n-1, and then take the square root.

Home Depot: [(79-80)² + (81-80)²] / (2-1) = 1 / 1 = 1

Lowe's: [(72-75.4)² + (78-75.4)² + (79-75.4)² + (76-75.4)² + (72-75.4)²] / (5-1) = 16.8 / 4 = 4.2

Step 4: Calculate the test statistic:

To calculate the test statistic, we use the formula:

[tex]t = (\bar x_1 - \bar x_2) / \sqrt((s_1^2/n_1) + (s_2^2/n_2))[/tex]

Substituting the values:

[tex]t = (80 - 75.4) / \sqrt{((1^2/2) + (4.2^2/5))}\\\\t = 4.6 / \sqrt(0.5 + 1.68)[/tex]

t ≈ [tex]4.6 / \sqrt(2.18)[/tex]

t ≈ 4.6 / 1.476

t ≈ 3.116

Step 5: Determine the p-value:

We need to find the p-value associated with the calculated test statistic. Since this is a two-sided test, we need to find the probability of observing a test statistic as extreme as t = 3.116 or more extreme in either tail of the t-distribution.

Using a t-distribution table or statistical software, the p-value is found to be p ≈ 0.021.

Step 6: Make a decision:

Compare the p-value to the significance level. Since the p-value (0.021) is less than the significance level (0.05), we have enough evidence to reject the null hypothesis.

Step 7: State the conclusion:

Based on the sample data, there is sufficient evidence to conclude that the average customer satisfaction rating for Home Depot is different from the average customer satisfaction rating for Lowe's at a significance level of 0.05.

Therefore, we can reject the null hypothesis and conclude that there is a significant difference in the average customer satisfaction ratings between Home Depot and Lowe's.

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Answer:

7,5 hours

Step-by-step explanation:

1/10+1/30=2/15

The store keeper used 125 pounds of flour worth $2.40 per pound and 175 pounds of flour worth $3 per pound to get 300 pounds of mixed flour.

The assertion that two expressions are equal when they are connected by the equals sign ("="), is the mathematical definition of an equation. As an example, 2x - 5 = 13. The equations in this example are 2x - 5 and 13. The symbol "=" links these two expressions together.

Let x be the number of pounds of the flour worth $2.40 per pound, and y be the number of pounds of the flour worth $3 per pound. Since the store keeper wants to end up with 300 pounds of flour, we have:

x + y = 300

We also know that the store keeper wants to sell the mixed flour for $2.05 per pound. This means that the total cost of the flour (x pounds at $2.40 per pound, plus y pounds at $3 per pound) must be equal to:

300 pounds × $2.05 per pound = $615

In other words:

2.40x + 3y = 615

Two equations with two unknowns are now present:

x + y = 300

2.40x + 3y = 615

We can find x and y using algebra. One way to do this is to solve the first equation for x:

x = 300 - y

We can then substitute this expression for x into the second equation:

2.40(300 - y) + 3y = 615

Expanding the parentheses and simplifying, we get:

720 - 2.4y + 3y = 615

0.6y = 105

y = 175

So, the store keeper used 175 pounds of flour worth $3 per pound. To find the amount of flour worth $2.40 per pound, we can substitute y = 175 into the equation x + y = 300:

x + 175 = 300

x = 125

Therefore, the store keeper used 125 pounds of flour worth $2.40 per pound and 175 pounds of flour worth $3 per pound to get 300 pounds of mixed flour.

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