Question

Call Wireless phone company charges $0.50 for the first call you make and $0.10 for each additional minute. The cost of a phone call can be expressed by the formula C = 0.50 + 0.10(m – 1), where C is the total cost in dollars and m is the number of minutes that you talk. If the bill for your phone call was $1.90, how long did you talk?
A.
12 minutes
B.
14 minutes
C.
15 minutes
D.
16 minutes

Answer 1

@blurbendy

Answer 2

just substitute those values in for m, until one of them equals 1.90