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klasskru [66]
4 years ago
13

What is 100 minus 6x equals 160 - 10x answer

Mathematics
1 answer:
In-s [12.5K]4 years ago
4 0
10 - 6x = 160 - 10x
     +6x            +6x

-10 + 6 = -4

10 = 160 - 4x
         -160

10 - 160 = -150

-4x = -150

-4x/4 = -150/-4 

x= 37.5
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Answer:

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7.25h + 5 = 6.5h + 10.25

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7.25h = 6.5h + 5.25

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The state education commission wants to estimate the fraction of tenth grade students that have reading skills at or below the e
irakobra [83]

Answer:

We need a sample size of at least 383.

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}}

85% confidence level

So \alpha = 0.15, z is the value of Z that has a pvalue of 1 - \frac{0.15}{2} = 0.925, so Z = 1.44.

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We need a sample size of at least n.

n is found with M = 0.03, \pi = 0.21

Then

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0.03 = 1.44\sqrt{\frac{0.21*0.79}{n}}

0.03\sqrt{n} = 1.44\sqrt{0.21*0.79}

\sqrt{n} = \frac{1.44\sqrt{0.21*0.79}}{0.03}

(\sqrt{n})^{2} = (\frac{1.44\sqrt{0.21*0.79}}{0.03})^{2}

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We need a sample size of at least 383.

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3 years ago
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Answer:

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