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Deffense [45]
3 years ago
10

PLEASE HELP ME ASAP!!! (DUE TOMORROW!!) Please help me with 9, 10, and 12!!!!!!!!!!

Mathematics
1 answer:
mina [271]3 years ago
4 0

9.B

10.C

12.B

12. You have to do the circumference of the circle and then divide it by 2.

10. 7^2 is not 14 it is 49 because 7*7 is 49.


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Assume a normal distribution and that the average phone call in a certain town lasted 4 min, with a standard deviation of 1 min.
olya-2409 [2.1K]

SOLUTION

The mean is 4min

standard deviation is 1min

the z score is

z=\frac{x-\bar{x}}{\sigma}

where

\begin{gathered} x=3 \\ \bar{x}=4 \\ \sigma=1 \end{gathered}

then we have

\begin{gathered} z=\frac{3-4}{1}=\frac{-1}{1}=-1 \\ z=-1 \end{gathered}

The probability the call lasted less than 3 min will be

Therefore, the probability that (z < -1 ) is

[tex]\begin{gathered} Pr(z<-1)=Pr(0Hence, the percentage of the calls that lasted less than 3 min is 16%

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1 year ago
One-fourth of a number is five-eights. Find the number. Simplify your answer
NNADVOKAT [17]

Answer:

2.50 or 2.5

Step-by-step explanation:

1/4=.25 so 25% of a number=5/8=0.625

So we multiply .625*4 to get the number. Since it's 25% and we want 100% to get it back to the original number

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3 years ago
Ana’s location is -30 feet below the cave entrance, Chilean location is -12 below the cave entrance. Which girl is located farth
sattari [20]

Answer:

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Step-by-step explanation:

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Read 2 more answers
Maria earned $126 in simple interest from her savings account. If she invested $450 for 7 years what was the interest rate?
RSB [31]
The answer is B. You didn't mention compounding, so I have to assume that this is simple interest. The formula for simple interest is 
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<span>$126 = $450 * X * 7. Now multiply $450 * 7 years = $3,150 </span>
<span>$126 = 3,150X </span>

<span>What has been done to the X? It was multiplied by $3,150. What is the opposite of multiplication? It is division. Remember that whatever we do to one side of the equal sign we must also do to the other side of the equal sign. </span>

<span>$126 = $3,150X </span>
<span>-------____---------- </span>
<span>$3,150__$3,150 </span>

<span>Any number over itself = 1. Now we have </span>
<span>.04 = X </span>

<span>To change a decimal to a percent move the decimal place two places to the right and add a percent sign. </span>
<span>.04 = 4$. The answer is B</span>
5 0
3 years ago
Which of the following is a mixed number. 2/5,5/2,2.3,2 1/2
icang [17]
2 1/2 is a mixed number

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