3 years ago

Please help me i cannot understand these Questions

Mathematics

1 answer:

elixir [45]3 years ago

6 0

Where are the questions

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A skydiver jumped out of a plane descended 0.8 miles in 2.5 minutes. What is the skydiver average change of altitude per minute?

Illusion [34]

Because .8 divided by 2.5 equals .3

8 0

3 years ago

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Find the size of each of two samples (assume that they are of equal size) needed to estimate the difference between the proporti

hodyreva [135]

Answer:

The sample size n = 4225

Step-by-step explanation:

We will use maximum error formula = $\frac{z_{a} S.D}{\sqrt{n} }$

but we will find sample size "n"

$\sqrt{n} = \frac{z_{a} S.D}{maximum error}$

Squaring on both sides , we get

$n = (\frac{z_{a} S.D}{maximum error})^2$

Given 99% confidence interval (z value) = 2.56

given maximum error = 0.02

$n = (\frac{z_{a} p(1-p)}{maximum error})^2$

n≤ $(\frac{2.56X\frac{1}{2} }{0.02}) ^{2}$ ( here S.D = p(1-p) ≤ 1/2

on simplification , we get n = 4225

<u>Conclusion</u>:

The sample size of two samples is n = 4225

<u>verification</u>:-

We will use maximum error formula = $\frac{z_{a} S.D}{\sqrt{n} }$ = $\frac{2.56 1/2}{\ \sqrt{4225} }$ = 0.0196

substitute all values and simplify we get maximum error is 0.02

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3 years ago

Which ordered pair is a solution to this system of equations?y = x2 – 3x + 3 y = 3x – 6

RSB [31]

Assuming the first term in the first equation is actually x^2, then the ordered pair is C. (3, 3).

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3 years ago

Please help! If you do you will get 'Brainliest'

aalyn [17]

Answer:

Step-by-step explanation:

This is because 1/2 down from 1 1/2 is 1 then go 2 down on the number lone and you get 1 (B)

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2 years ago

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From the midpoint of the line segment whose end points are (5, 9) and (-3, 7)

Dmitry [639]

Mid-point= $( \frac{ x_{1}+ x_{2} }{2} ,\frac{ y_{1} y_{2} }{2}$
Mid-point=( $\frac{5+(-3)}{2} , \frac{9+7}{2}$
Mid-point=(1, 8)

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3 years ago