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3 years ago

FIRST PERSON TO ANSWER WILL GET BRAINLIEST

Mathematics

2 answers:

stellarik [79]3 years ago

6 0

Answer:

i hope i helped i wasnt sure how to answer

Step-by-step explanation:

Sav [38]3 years ago

3 0

Answer:

$45

Step-by-step explanation:

let's work backwards. We know that it was 20% off, or otherwise 80% of the original cost. Let's represent the original cost with x:

0.8x = 36

Now we solve for x by dividing both sides by 0.8:

x = 45

Thus, the sweater was originally $45

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Find the specific solution of the differential equation dy/dx equals the quotient of 2 times y and x squared with condition y(-2

love history [14]

Answer:

B. y = e^(-2/x).

Step-by-step explanation:

dy/dx = 2y / x^2

Separate the variables:

x^2 dy = 2y dx

1/2 * dy/y = dx/x^2

1/2 ln y = = -1/x + C

ln y = -2/x + C

y = Ae^(-2/x) is the general solution ( where A is a constant).

Plug in the given conditions:

e = A e^(-2/-2)

e = A * e

A = 1

So the specific solution is y = e^(-2/x).

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3 years ago

I am F years old and my brother is B years older. What is the sum of our ages? What will be the sum of our ages in three years?

dem82 [27]

a) The sum of your ages is F + (F+B) = 2F+B.

b) In 3 years, the sum of your ages will be (F+3)+(F+B+3) = 2F+B+6.

c) The difference of your ages at any time is B.

8 0

3 years ago

the farmer's market sells apples for $2 each per pound and oranges doe $1 per pound he sells $56 of apples how many apples does

Effectus [21]

Answer:

28 lb

Step-by-step explanation:

If 1 lb of applies is $2, then 56 / 2 is the number of pounds sold.

3 0

3 years ago

Pls help I need help

kiruha [24]

Answer:

3:2

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

2. A marketing firm is trying to estimate the proportion of potential car buyers that would consider

Maurinko [17]

Answer:

a. The number of people that should be in the pilot study are 600 people

b. The point estimate is 0.62 $\overline 6$

c. At 95% confidence level the true population proportion of potential car buyers of hybrid vehicle is between the confidence interval (0.588, 0.6654)

d. Two ways to reduce the margin of error are;

1) Reduce the confidence interval

2) Use a larger sample size

Step-by-step explanation:

a. The given parameters for the estimation of sample size is given as follows;

The margin of error for the confidence interval, E = 4% = 0.04

The confidence level = 95%

The sample size formula for a proportion as obtained from an online source is given as follows;

$n = \dfrac{Z^2 \times P \times (1 - P)}{E^2}$

Where, P is the estimated proportions of the desired statistic, therefore, we have for a new study, P = 0.5;

Z = The level of confidence at 95% = 1.96

n + The sample size

Therefore, we have;

$n = \dfrac{1.96^2 \times 0.5 \times (1 - 0.5)}{0.04^2} = 600.25$

Therefore, the number of people that should be in the pilot study in order to meet this goal at 95% confidence level is n = 600 people

b. The point estimate for the population proportion is the sample proportion given as follows;

$\hat p = \dfrac{x}{n}$

Where;

x = The number of the statistic in the sample

n = The sample size

From the question, we have;

The number of potential car buyers, n = 600

The number of respondent in the sample that indicated that they would consider purchasing a hybrid, x = 376

Therefore, the point estimate, for the proportion of potential car buyers that would consider buying a hybrid vehicle, $\hat p$ = 376/600 = 0.62 $\overline 6$