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3 years ago

Which expression is equivalent to 84+48

Mathematics

1 answer:

padilas [110]3 years ago

4 0

The answer is a
-hope this helped-

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From least to greatest 2/3 -4 1/2 1/4 - 1/2 2 1/3

tamaranim1 [39]

Answer: -4 1/2 , -1/2 , 1/4 , 2/3 , 2 1/3

Step-by-step explanation:

4 0

3 years ago

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HELP ASAP! <br> What is the measure of the diameter of A?

Andrews [41]

Answer:

11cm

Step-by-step explanation:

C= $\pi$ d

34.54cm= $\pi$ d

d=34.54cm/ $\pi$

d=11cm (aprrox.)

7 0

3 years ago

What was 42/3as a mixed number

stiks02 [169]

This fraction cannot be changed to a mixed number because 3 can divide 42 to give 14. Hope i helped. Have a nice day.

5 0

3 years ago

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Solve for x.<br> X + 142<br> 135°

Lyrx [107]

Answer:

X=-7

Step-by-step explanation:

X + 142=135°

X=135-142

X=-7

So the value of X is -7

4 0

3 years ago

A researcher wishes to estimate, with 99% confidence, the population proportion of adults who think the president of their co

scoray [572]

Answer:

a. n=4148

b. n=3909

c. The sample size is smaller if a known proportion from prior study is used. The difference in sample sizes is 239

Step-by-step explanation:

a. For sample where no preliminary estimate is given, the minimum sample size is calculated using the formula:

$n=p(1-p)(\frac{z}{ME})^2$

Where:

$ME=$ Margin of error
$p=$ is the assumed proportion

#Let p=0.5, substitute in the formula to solve for n:

$n=0.5(1-0.5)\times (2.576/0.02)^2\\\\=4147.36\approx 4148$

Hence, the minimum sample size is 4148

b. If given a preliminary estimate p=0.38, we use the same formula but substitute p with the given value:

$n=p(1-p)(z/ME)^2\\\\=0.38(1-0.38)(2.576/0.02)^2\\\\=3908.47\approx3909$

Hence, the minimum sample size is 3909

c. Comparing the sample sizes from a and b:

$n_{0.5}>n_{0.38}\\\\n_{0.5}-n_{0.38}=4148-3909=239$

Hence, the actual sample size is smaller for a known proportion from prior a prior study.

8 0

3 years ago