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san4es73 [151]
3 years ago
10

One of the numbers was increased by 10 and the other remained the same. How did the average of the two numbers change?

Mathematics
1 answer:
Alexxandr [17]3 years ago
6 0
10+0=10
10÷2=5
The average is 5.
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Solve for x. NEED ANSWER ASAP TYY SO MUCH IN ADVANCE
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Answer:

x = 10√3

Step-by-step explanation:

Because of the right angles, we can use Pythagoras

30² - x² = y²  (a) Largest triangle

y² - 20² = h² (b) Medium triangle

substitute y² from (a) into (b)

30² - x² - 20² = h²

500 - x² = h²  (d)

x² - h² = (30 - 20)² (c) smallest triangle

substitute h² from (d) into (c)

x² - (500 - x²) = 100

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3 years ago
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salantis [7]

B. A quadrilateral equals 360, a triangle 180. 360-180=180

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What is the difference between slope intercept and point slope form?
antiseptic1488 [7]

Answer:

Step-by-step explanation:

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2 years ago
What is the slope of the line that passes through the points (9, -1) and (4, -11)?
mixas84 [53]

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2

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Reading proficiency: An educator wants to construct a 99.5% confidence interval for the proportion of elementary school children
Shkiper50 [21]

Answer:

A sample size of 345 is needed so that the confidence interval will have a margin of error of 0.07

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 of the interval is given by:

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

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p = 0.69

99.5% confidence level

So \alpha = 0.005, z is the value of Z that has a pvalue of 1 - \frac{0.005}{2} = 0.9975, so Z = 2.81.

Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.07?

This is n when M = 0.07. So

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(\sqrt{n})^{2} = (18.5658)^{2}

n = 345

A sample size of 345 is needed so that the confidence interval will have a margin of error of 0.07

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3 years ago
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