Water flows from the bottom of a storage tank at a rate of
r(t) = 300 − 6t
liters per minute, where 0 ≤ t ≤ 50. find the amount of water that flows from the tank during the first 45 minutes.

Acompany charges $0.10 for each letter engraved. bobby plans to spend no more than $5.00 on the engraving on a jewelry box. write and solve an inequality to find the maximum number of letters he can have engraved.