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asambeis [7]
2 years ago
9

NEEDED ASAP WILL GIVE BRAINLIEST TO BEST ANSWER

Mathematics
1 answer:
madam [21]2 years ago
3 0

Answer:

<h2>for 14 is Surface are =2*(7*5+7*3+5*3)= 142 feet cube </h2>

for 13 Surface are= 2*(9*7.2+9*9+7.2*9)= 421 m cube

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The perimeter of a rectangular playground is 46m. If the length of the park is 7m, what is the width of the park?
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Answer:

16m

Step-by-step explanation:

Since the length of the park is 7m, then the other side is also 7m so 46-14 is 32. So 32/2 is 16.

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What is the sum of three consecutive even numbers is 30?
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8, 10, 12

A helpful equation:
x+x+1+x+2 = 30

Combine like terms
3x + 3 = 30

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x = 9

x = 9. However, 9 is not an even number. Let’s subtract 1 from 9 to get the first even number.

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3 years ago
A researcher surveyed 220 residents of a city about the number of hours they
olga55 [171]

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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, we have to find z in the Ztable as such z has a pvalue of 1 - \alpha.

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

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