Question

1. The cost of a long-distance telephone call is given by the function
C(m) = 0.05m + 1.15

where m is the length of the call in minutes. Determine how long a phone call can be made for $3.15.
45 minutes
63 minutes
40 minutes
35 minutes

Answer 1

40 is the ans.
Just insert the given quantity and solve for m.

Answer 2

Thank You :)