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3 years ago

What is the first step to solving this equation (5x-11=42)?

2 answers:

8 0

What is the first step to solving this equation (5x-11=42)?
A. add 11 to both sides
B. divide both sides by 5
C. multiply both sides by 5
D. subtract 11 from both sides

Add the inside number so it would be A

Agata [3.3K]3 years ago

3 0

Answer:

First, you have to add 11 on both sides, so the answer is A

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3 years ago

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3 years ago

GEOMETRY SIDE LENGTHS

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3 years ago

You recently sent out a survey to determine if the percentage of adults who use social media has changed from 66%, which was the

il63 [147K]

Answer:

The 98% confidence interval estimate of the proportion of adults who use social media is (0.56, 0.6034).

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 $1 - \frac{\alpha}{2}$ .

Of the 2809 people who responded to survey, 1634 stated that they currently use social media.

This means that $n = 2809, \pi = \frac{1634}{2809} = 0.5817$

98% confidence level

So $\alpha = 0.02$ , z is the value of Z that has a pvalue of $1 - \frac{0.02}{2} = 0.99$ , so $Z = 2.327$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.5817 - 2.327\sqrt{\frac{0.5817*4183}{2809}} = 0.56$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.5817 + 2.327\sqrt{\frac{0.5817*4183}{2809}} = 0.6034$

The 98% confidence interval estimate of the proportion of adults who use social media is (0.56, 0.6034).

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3 years ago

(URGENT) Will give 25 points

Studentka2010 [4]

Volume = 2 x 6 x 1 + 1 x 2 x 2
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3 years ago

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