It costs $34.95 to rent a jet ski for 4 hours plus $15.75 for each each additional hour you have $100 can you rent the jet ski for 8 hours?
Rent a ski jet for X hours
Cost of rental is 34.95 + 15.75*(X - 4)
We want cost <= 100, i.e.
34.95 + 15.75*(X - 4) <= 100
15.75*(X - 4) <= 100 - 34.95
15.75*(X - 4) <= 65.05
X - 4 <= 65.05 / 15.75
X - 4 <= 4.13
X <= 8.13 hrs
So, the jet-ski can be rented for less that $100 if the number of hours rental is less than 8
Check
8 hrs rental
Cost = 34.95 + 4*17.75 = 34.95 + 63 = 97.85 < 100