Question

The cost of a long-distance telephone call is given by the function
C(m) = 0.05m + 1

where m is the length of the call in minutes. Determine how long a phone call can be made for $3.75.
55 minutes
50 minutes
110 minutes
75 minutes

Answer 1

0.05m+1 = 3.75
0.05m = 2.75 (subtract 1 from both sides)
m = 55 (divide 2.75 by 0.05)

Answer 2

thanks again