Question

The total cost to park a car in a parking garage that has an entry fee of $4 can be determined by using the equation c = 2h + 4
where c is the total cost and h is the number of hours the car is in the garage. The garage informed Robert that the entry fee had changed and that his bill for parking his car for 6 hours is $20.

Which equation models the cost to park his car for h hours with the new entry fee?

A. c = 2h + 20
B. c = h + 6
C. c = 2h + 8
D. c = h + 14

Answer 1

if only entry fee changed, then 2h will still remain constant so 20=2*6+entry fee find entry fee.

Answer 2

c = 2h + fee h stays the same 6
when fee = 4 cost = 2(6)+ 4 = 16
when cost = 20 = 16 + (20-16) = 2h + 4 + 4 = 2h + 8
new cost, c = 2h + 8