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4 years ago

-3x+5>17 what is the value of x in the set of inequality

Mathematics

1 answer:

Degger [83]4 years ago

4 0

Answer:

x < -4

Step-by-step explanation:

-3x + 5 > 17

17 - 5 = 12

-3 x 4 = -12 (wrong)

-3 x -4 = 12 (correct)

12 + 5 > 17( wrong)

something less than a negative four

when you multiply or divide a negative to get a specific amount of number for the variable you have to flip the symbol.

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So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

How large a sample size is needed to be 95% confident with a margin of error of E?

A sample size of n is needed, and n is found when M = E.

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

$E = 1.96\sqrt{\frac{0.3696*0.6304}{n}}$

$E\sqrt{n} = 1.96\sqrt{0.3696*0.6304}$

$\sqrt{n} = \frac{1.96\sqrt{0.3696*0.6304}}{E}$

$(\sqrt{n})^2 = (\frac{1.96\sqrt{0.3696*0.6304}}{E})^2$

$n = (\frac{1.96\sqrt{0.3696*0.6304}}{E})^2$

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