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irina1246 [14]
3 years ago
6

Solve these equation 4(m+7)=44

Mathematics
1 answer:
Sphinxa [80]3 years ago
5 0
4m+28=44
4m=44-28
4m=16
m=16/4
m=4
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Voltage = 220 v Current = 4 amps Resistance = <br> 18 <br> 55 <br> 224 <br> 880
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Hi.

I believe the formula for R when you have the voltage and current is:

V/I = R

Plugging in the numbers:

220/4 = 55

The answer is the second option, 55.
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2 years ago
A simple random sample of electronic components wil be selected to test for the mean lifetime in hours. Assume that component li
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Answer:

189 components must be sampled.

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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That is z with a pvalue of 1 - 0.005 = 0.995, so Z = 2.575.

Now, find the margin of error M as such

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n components must be sampled.

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3 = 2.575\frac{16}{\sqrt{n}}

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189 components must be sampled.

4 0
3 years ago
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