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 number of minutes a
customer used if we know o and C?
(C - 12)
A m=
B. m = (C - 12) - 0
C. m = C - 120
Dm 9-12