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3 years ago

Find the area to the nearest tenth, if necessary.

Mathematics

1 answer:

erica [24]3 years ago

8 0

Answer:

28.3

Step-by-step explanation:

formula for area of of a circle is

A = πr²

3² = 9

3.14 * 9 = 28.26

rounded to tenth power = 28.3

Hope this helps dude

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Mileage tests are conducted for a particular model of automobile. If a 98% confidence interval with a margin of error of 1 mile

Llana [10]

Answer: 37

Step-by-step explanation:

Given : Significance level : $\alpha:1-0.98=0.02$

Critical value : $z_{\alpha/2}=z_{0.01}=2.33$

margin of error : E= 1 mile per gallon

Population standard deviation: $\sigma=2.6$ miles per gallon.

We know that when the population standard deviation is known then the formula to find the sample size is given by :

$n=(\dfrac{z_{\alpha/2}\times \sigma}{E})^2$

$n=(\dfrac{(2.33)\times 2.6}{1})^2=36.699364\approx37$ [Round to the next whole number.]

Hence, the required number of automobiles should be used in the test = 37

7 0

4 years ago

June was thinking of a number. June doubles it, then adds 18 to get an answer of 90.7. What was the original number?

stiv31 [10]

Answer:

81.7

Step-by-step explanation:

90.7-18 divided by 2 = 81.7 or 82 simplified

8 0

3 years ago

9. Evaluate (-7) -10 ÷ (-28)-10<br> pls solve fast

Juli2301 [7.4K]

Answer:

17/38 or ≈ 0.45

Step-by-step explanation:

(-7) -10 / (-28)-10

= -17 / -38

= 17/38

You can keep the answer in fraction as 17/38 or ≈ 0.45

Hope this help you :3

7 0

3 years ago

If $3,600 is invested at a rate of 2.4% that is compounded annually, how much will it be worth after 9 years?

Alex787 [66]

Amount after 9 years = 3600( 1 + 0.024)^9 = $4456.58

7 0

3 years ago

Read 2 more answers

Can someone help pls

finlep [7]

It’s C like the guy said

4 0

3 years ago