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2. A phone company charges a base fee of $12 per month plus an additional charge per minute. The

monthly phone cost C can be represented by this equation: C = 12 +a.m, where a is the additional
charge per minute, and m is the number of minutes used.
Which equation can be used to find the # of minutes a customer used if we know and a and C?
A. m = (C-12)
B. m = (C - 12)-a
C. m = C - 12a
(C-12)
D. m =
a
E. m = 8-12

User Igniter
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1 Answer

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Given:

The monthly phone cost C can be represented by this equation:


C=12+a\cdot m

where, a is the additional charge per minute, and m is the number of minutes used.

To find:

The equation can be used to find the number of minutes a customer used if we know and a and C.

Solution:

We have,


C=12+a\cdot m

We need to isolate m on one side.

Subtract 12 from both sides.


C-12=a\cdot m

Divide both sides by a.


(C-12)/(a)=(a\cdot m)/(a)


(C-12)/(a)=m


m=(C-12)/(a)

The options are not in proper format.

Therefore, the required equation is
m=(C-12)/(a).

User Realli
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