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levacccp [35]
3 years ago
5

X3 - (25 • 2) = 75 x =

Mathematics
2 answers:
r-ruslan [8.4K]3 years ago
8 0

Answer:

x=5

Step-by-step explanation:

x^3-(25*2)=75

(25*2)= 50

x^3-50=75

     +50   +50

x^3=125

(divide)

x=5

dalvyx [7]3 years ago
4 0

Answer: x= 125/3

hope its right

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Answer:

The required sample size for the new study is 801.

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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0.03\sqrt{n} = 1.96\sqrt{0.25*0.75}

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The required sample size for the new study is 801.

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