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Vika [28.1K]
3 years ago
5

Charlene's long distance telephone service charges $7.50 per month plus $0.12 for each minute. Her bill last month was $13.02. W

hat equation represents the amount of her last bill, and how many minutes did Charlene use last month?
A.
7.50 + $0.24m = 13.02; m = 101 minutes
B.
7.50 - $0.12m = 13.02; m = 66 minutes
C.
7.50 + $0.12m = 13.02; m = 46 minutes
D.
7.50 - $0.24m = 13.02; m = 171 minutes
Mathematics
2 answers:
White raven [17]3 years ago
8 0

Answer:

C. 7.50+$0.12m=13.02; m=46 minutes

Step-by-step explanation:

7.50+.12m=13.02

-7.50           -7.50

<u>.12m</u>=<u>5.52</u>

.12      .12

m=46 minutes

Varvara68 [4.7K]3 years ago
6 0
Charlene used 46 minutes
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Step-by-step explanation:

For this case we have the following data given:

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\bar X = \frac{\sum_{i=1}^n X_i}{n}

And replacing we got:

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s = \sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}

And replacing we got:

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