Answer:
90 miles
$81
Step-by-step explanation:
Let m = number of miles driven.
Plan A:
cost = 0.40m + 45
Plan B:
cost = 0.90m
0.90m = 0.40m + 45
0.5m = 45
m = 90
The plans cost the same for 90 miles.
cost = 0.9m = 0.9(90) = 81
The cost is $81.
