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stealth61 [152]
3 years ago
14

What shows the expression 20a - 5a

Mathematics
1 answer:
tekilochka [14]3 years ago
3 0

Answer:

20a-5a=15a

Step-by-step explanation:

20-5=15aaaaaaaa

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How do you get a quadratic equation from a graph?​
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Solve v = 1/3 bh for b the base of the cone
Viefleur [7K]

Answer:

<h2>b =  \frac{3v}{h}</h2>

Step-by-step explanation:

<h3>v =  \frac{1}{3} bh</h3>

First of all multiply through by 3

That's

<h3>3v =  \frac{1}{3}  \times bh</h3>

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We have the final answer as

<h3>b =  \frac{3v}{h}</h3>

Hope this helps you

3 0
3 years ago
Given that lines a and b are parallel, angles 1 and 5 are congruent because they are corresponding angles, and angles 1 and 4 ar
tiny-mole [99]

Answer:

Transitive Property of Congruency;If parallel lines have a transversal, then alternate interior angles are congruent.

The Transitive Property of Congruency:

If 2 angles are congruent to a third angle, then they are congruent to each other. So, since angles 4 and 5 are both congruent to angle 1, they are congruent to each other.

Angles 4 and 5 are alternate interior angles. Therefore, if parallel lines have a transversal, alternate interior angles are congruent.

7 0
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Read 2 more answers
In 2009 a survey of Internet usage found that 79 percent of adults age 18 years and older in the United States use the Internet.
Alex777 [14]

Answer:

0.025 = 2.33\sqrt{\frac{0.79*0.21}{n}}

Option d.

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}}

79 percent of adults age 18 years and older in the United States use the Internet.

This means that \pi = 0.79

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 = 2.33.

Which of the following should be used to find the sample size (n) needed?

We have to find n for which M = 0.025

So the equation is:

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

0.025 = 2.33\sqrt{\frac{0.79*0.21}{n}}

Option d.

4 0
3 years ago
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