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3 years ago

Solve the equation 34 = -2 + 9x + 16 + x

Mathematics

2 answers:

sdas [7]3 years ago

8 0

The answer for this equation is x=2

-Dominant- [34]3 years ago

7 0

Answer:

2=x

Step-by-step explanation:

34 = -2 + 9x + 16 + x

+2 +2 add to both sides

36=9x+16+x

36=10x+ 16 simplify

-16 -16 subtract from both sides

20=10x

/10 /10 divide on both sides

2=x

PLEASE MARK BRAINLIEST!!!

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A random sample of medical files is used to estimate the proportion p of all people who have blood type B. (a) If you have no pr

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Answer:

a) 752 medical files should be included.

b) 372 medical files should be included.

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.

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Question a:

This is n for which M = 0.03. We have no estimate, so we use $\pi = 0.5$ . So

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

$0.03 = 1.645\sqrt{\frac{0.5*0.5}{n}}$

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Question b:

Now we have that:

$\pi = \frac{13}{90} = 0.1444$

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

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$0.03\sqrt{n} = 1.645\sqrt{0.1444*0.8556}$

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$(\sqrt{n})^2 = (\frac{1.645\sqrt{0.1444*0.8556}}{0.03})^2$

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