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3 years ago

How do you find x???

Mathematics

2 answers:

sergij07 [2.7K]3 years ago

6 0

The first thing you want to do is isolate the (x)s.

nikdorinn [45]3 years ago

4 0

0.6x-5=0.1x+7
0.5x-5=7 (subtract 0.1x from both sides)
0.5x=12 (add 5 to both sides)
x=24 (divide both sides by 0.5)

Hope this helps!

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Suppose that a market research firm is hired to estimate the percent of adults living in a large city who have cell phones. 500

Alborosie

Answer:

The 95% confidence interval estimate for the true proportion of adults residents of this city who have cell phones is (0.81, 0.874).

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

For this problem, we have that:

$n = 500, \pi = \frac{421}{500} = 0.842$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.842 - 1.96\sqrt{\frac{0.842*0.158}{500}} = 0.81$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.842 + 1.96\sqrt{\frac{0.842*0.158}{500}} = 0.874$

The 95% confidence interval estimate for the true proportion of adults residents of this city who have cell phones is (0.81, 0.874).

6 0

3 years ago

If the temperature were to drop 38 degrees, which number would display this best?

emmasim [6.3K]

I think it might be -38, not 100% though.

3 0

3 years ago

Find the next four terms of the sequence 5, 4, 9, 13, 22

Ganezh [65]

Hello,

It is the Fibonacci 's suit.

$u_1=5\\u_2=4\\u_3=u_1+u_2=5+4=9\\u_4=u_2+u_3=4+9=13\\u_5=u_3+u_4=9+13=22\\u_6=13+22=35\\u_7=22+35=57\\u_8=35+57=92\\u_9=57+92=149\\\\\\\boxed{u_{n+2}=u_{n}+u_{n+1}}\\$

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2 years ago

3∙(a+x), if a=8; x=−10

Oksi-84 [34.3K]

Your answer should be -6

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3 years ago

An experiment consists of rolling two fair dice and adding the dots on the two sides facing up. What is the probability that the

notka56 [123]

C. 1/12
The answer should be C. 1/12.

4 0

2 years ago