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3 years ago

9

−7x > 4(−3x − 5) I'm bad at math

2 answers:

VashaNatasha [74]3 years ago

6 0

-7x>4(-3x-5) do the distributive property

-7x>-12x-20 add 12 x to both sides

5x>-20 divide both sides by 5

x>-4

Hope that helps

brainliest is always appreciated

timama [110]3 years ago

5 0

$-7x>4(-3x-5)\qquad\text{use distributive property}\\\\-7x > (4)(-3x)+(4)(-5)\\\\-7x >-12x-20\qquad\text{add 12x to both sides}\\\\5x>-20\qquad\text{divide both sides by 5}\\\\\boxed{x>-4}$

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Vesna [10]

Answer:

A sample size of at least 1,353,733 is required.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , we have the following confidence interval of proportions.

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

In which

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The margin of error is:

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

You would like to be 98% confident that you esimate is within 0.1% of the true population proportion. How large of a sample size is required?

We need a sample size of at least n.

n is found when M = 0.001.

Since we don't have an estimate for the proportion, we use the worst case scenario, that is $\pi = 0.5$

So

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

$0.001 = 2.327\sqrt{\frac{0.5*0.5}{n}}$

$0.001\sqrt{n} = 2.327*0.5$

$\sqrt{n} = \frac{2.327*0.5}{0.001}$

$(\sqrt{n})^{2} = (\frac{2.327*0.5}{0.001})^{2}$

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Rounding up

A sample size of at least 1,353,733 is required.

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3 years ago

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aleksandrvk [35]

Answer:

26.6

Step-by-step explanation:

Solution for What is 35 percent of 76:

35 percent *76 =

( 35:100)*76 =

( 35*76):100 =

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Now we have: 35 percent of 76.6 = 26.6

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