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mel-nik [20]
3 years ago
8

Use a graph to solve the equation 7x+3=9x-13 x=

Mathematics
1 answer:
san4es73 [151]3 years ago
3 0
Subtract 7x from both sides
3=9x-13-7x
simplify 9x-13-7x to 2x-13
3=2x-13
Add 13 to both sides
3+13=2x
simplify 3+13 to 16
16=2x
simplify both sides by 2
16/2=x
simplify16/2 to 8
x=8
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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, find the margin of error M as such

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In which \sigma is the standard deviation of the population and n is the size of the sample.

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n is found when M = 10. So

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