Brian has 66 water bottles for the 5K race participants. In addition, he is planning to buy some boxes of water bottles that have 18 water bottles each. All of the boxes cost the same. Brian is not sure yet
about the number of boxes of water bottles he wants to buy, but he has enough money to buy up to
5 of them. Write a function to describe how many water bottles Brian can buy. Let x represents the
number of boxes of water bottles Brian buys. Find a reasonable domain and range for the function.