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Mathematics

2 answers:

Sliva [168]3 years ago

8 0

Answer:

The choice three;

$b = \frac{2A}{h}$

Step-by-step explanation:

$\frac{1}{2} bh = A \\ b = A \div ( \frac{1}{2} h) \\ b = A \times ( \frac{2}{h} ) \\ \\ b = \frac{2A}{h}$

katrin [286]3 years ago

8 0

Answer:

I think the answer is the third

thirdone

Step-by-step explanation:

1/2 bh = A

bh = 2A (1/2 move to the other side and multiply 2 by A)

b = 2A/h (h move to the other side and divide 2A by h)

Hope you can understand ittttt^^

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Answer:

865

Step-by-step explanation:

We have that in 95% confidence level the value of z has a value of 1.96. This can be confirmed in the attached image of the normal distribution.

Now we have the following formula:

n = [z / E] ^ 2 * (p * q)

where n is the sample size, which is what we want to calculate, "E" is the error that is 2% or 0.02. "p" is the probability they give us, 5 out of 50, is the same as 1 out of 10, that is 0.1. "q" is the complement of p, that is, 1 - 0.1 = 0.9, that is, the value of q is 0.9.

Replacing these values we are left with:

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n = 864.36

865 by rounding to the largest number.