Question 122612: Mack's Parking Garage charges $4.00 for the first hour and $2.50 for each additional hour. For how long has a car been parked when the charge exceeds $16.50?
Answer by oscargut(2103)   (Show Source):
You can put this solution on YOUR website! Let x= hours that the car has been parked so:
for example you have to pay 4+2,5(2) for 3 hours then in gral
you have to pay 4 +2,5(x-1)for x hours
so you have to resolve 4 +2,5(x-1)> 16,5 so 2,5(x-1)>12,5 so 2,5x>15 so x>6
R:The car has been parked for more than 6 hours
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