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3 years ago

Pweeb help for brainliest

Mathematics

2 answers:

stellarik [79]3 years ago

5 0

Answer:

The correct answer is B

Step-by-step explanation:

2(x-1) + 5x = x-8

Firstly, break all the brackets and you would got:

2x - 2 + 5x = x - 8

Put x into 1 side,

2x + 5x - x = -8 + 2

6x = -6

Divide both side by 6,

6x / 6 = -6/6

x = -1

The correct answer is B

Hope this help you :3

devlian [24]3 years ago

4 0

Answer:

The answer is -1 (B)

Step-by-step explanation:

Given the equation 2(x-1) + 5x = x-8.

To solve the equation for x;

Step 1: open up the bracket in the equation to have;

2x-2+5x = x-8

Step 2: bring all the terms on the right hand side to the left to have;

2x-2+5x-x+8 = 0

Step3: collect the like terms to have;

2x+5x-x-2+8 = 0

6x+6 =0

Step 4: subtract 6 from both sides to have;

6x+6-6 = 0-6

6x = -6

Step 5: divide both sides by the coefficient of x which is 6 to get x.

6x/6 = -6/6

x = -1

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You choose two different movies on a list at random. Out of 15 movies on the list, 9 are action movies. The first movie you choo

docker41 [41]

Answer:

the probability is 8/15 depending on whether the problem counts the drawing one out of the bag as one gone. Leaving the first one drawn, the probability would be 3/5.

Step-by-step explanation:

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3/5 is the probability of drawing an action movie from the bag. However, since you just drew one out, the fraction changes to 8/15.

5 0

3 years ago

An automobile manufacturer would like to know what proportion of its customers are not satisfied with the service provided by th

butalik [34]

Answer:

a) A sample size of 5615 is needed.

b) 0.012

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

99.5% confidence level

So $\alpha = 0.005$ , z is the value of Z that has a pvalue of $1 - \frac{0.005}{2} = 0.9975$ , so $Z = 2.81$ .

(a) Past studies suggest that this proportion will be about 0.2. Find the sample size needed if the margin of the error of the confidence interval is to be about 0.015.

This is n for which M = 0.015.

We have that $\pi = 0.2$

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.015 = 2.81\sqrt{\frac{0.2*0.8}{n}}$

$0.015\sqrt{n} = 2.81\sqrt{0.2*0.8}$

$\sqrt{n} = \frac{2.81\sqrt{0.2*0.8}}{0.015}$

$(\sqrt{n})^{2} = (\frac{2.81\sqrt{0.2*0.8}}{0.015})^{2}$

$n = 5615$

A sample size of 5615 is needed.

(b) Using the sample size above, when the sample is actually contacted, 12% of the sample say they are not satisfied. What is the margin of the error of the confidence interval?

Now $\pi = 0.12, n = 5615$ .