2 years ago

Help please giving brainliest

Mathematics

2 answers:

svet-max [94.6K]2 years ago

5 0

A just add the numbers

rewona [7]2 years ago

4 0

Answer:

A: 28 cm

Step-by-step explanation:

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Keith exercises x hours a week. Troy exercises three hours less than Keith and Joe exercises two times more than Troy. Which exp

umka21 [38]

If Keith is represented by x, and Joe is three less than Keith, Troy is represented by x-3.
Then, we know that Joe exercises for twice the amount of time as Troy, we multiply the expression for Joe by two.

Keith = x
Troy = x-3
Joe = 2(x-3)

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3 years ago

What is the average rate of change between (3,2) and (1,9)

hjlf

Answer:

-0.25

Step-by-step explanation:

1-3= -2

9-2= 8

-2/8= -0.25

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2 years ago

The scores on a test given to all juniors in a school district are normally distributed with a mean of 72 and a standard deviati

faust18 [17]

30% is the correct answer.

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3 years ago

stat: sample of 780 adults in the U.S.A., it was found that 80 of those had a pinworm infestation. You want to find the 99% conf

Anettt [7]

Answer: 554

Step-by-step explanation:

If prior population proportion is known, then the formula to find the sample size is given by :-

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2$

As per given description, we have

p= 0.1

E=0.025

Critical z-value for 95% confidence : $z_{\alpha/2}=1.96$

Then,

$n=0.1(1-0.1)(\dfrac{1.96}{0.025})^2=553.1904\approx554$

Hence, the minimum sample size required = 554.

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3 years ago

The function c(x)=35x+75 r

Sonbull [250]

Math Papa is a very good calculator. You can try it. Just put the equation www.mathpapa.com :)

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2 years ago