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PilotLPTM [1.2K]
3 years ago
14

What value of x would make 3x-9 equals to 39

Mathematics
2 answers:
Sliva [168]3 years ago
7 0

Answer:

x=16

Step-by-step explanation:

3 times 16 equals 48 minus 9 equals 39

juin [17]3 years ago
5 0

Answer:

16

Step-by-step explanation:

To solve the equation you must isolate the variable.

3x-9=39

So first, add 9 to both sides

3x-9+9=39+9

3x=48

Then divide both sides by 3

3x/3=48/3

x=16

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Answer:

A sample of 997 is needed.

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}}

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The margin of error is of:

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This means that \pi = 0.08

98% confidence level

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How large a sample is needed in order to be 98% confident that the sample proportion will not differ from the true proportion by more than 2%?

This is n for which M = 0.02. So

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

0.02 = 2.327\sqrt{\frac{0.08*0.92}{n}}

0.02\sqrt{n} = 2.327\sqrt{0.08*0.92}

\sqrt{n} = \frac{2.327\sqrt{0.08*0.92}}{0.02}

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Rounding up:

A sample of 997 is needed.

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3 years ago
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Answer:

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