Let
x ----> number of miles
y ---> total charge
n ----> number of days
10 1/2 cents=10.5 cents=$0.105
so
y=29.95n+0.105x
For x=214.8 miles
n=3 days
y=29.95(3)+0.105(214.8)
y=$112.40
7.6m questions
10.1m answers