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3 years ago

6

Apply the distributive property to factor out the greatest common factor. 15+21= ?

1 answer:

Gala2k [10]3 years ago

6 0

Answer:

<h2>15 + 21 = 3(5 + 7)</h2>

Step-by-step explanation:

$\text{The distributive property:}\ a(b+c)=ab+ac\\\\15=3\cdot5\\21=3\cdot7\\\\15+17=3\cdot5+3\cdot7=3\cdot(5+7)$

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omeli [17]

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$d\pi$

So, solving for both the radius and the diameter gives us:

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The area of a circle is $\pi r^2$ , which means we can just plug in the radius and find our area:

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4 years ago

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Lana71 [14]

Answer:

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Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

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Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

What is the minimum sample size required to create the specified confidence interval

This is n when $M = 0.06, \sigma = 1.1$

$0.06 = 2.575*\frac{1.1}{\sqrt{n}}$

$0.06\sqrt{n} = 2.575*1.1$

$\sqrt{n} = \frac{2.575*1.1}{0.06}$

$(\sqrt{n})^{2} = (\frac{2.575*1.1}{0.06})^{2}$

$n = 2228.6$

Rounding up

The minimum sample size required to create the specified confidence interval is 2229.

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3 years ago

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Vanyuwa [196]

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