A contractor purchases gravel one cubic yard at a time.

(a) A gravel driveway L yards long and 6 yards wide is to be poured to a depth of 1 foot. Find a formula for n(L), the number of cubic yards of gravel the contractor buys, assuming that he buys 12 more cubic yards of gravel than are needed (to be sure he'll have enough).

n(L)= ________ cubic yards help

(b) Assuming no driveway is less than 5 yards long or more than 9 yards long, find the domain and range of n(L).

Domain: help (numbers)

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