You are making treat bags for a birthday party. You have made 3 bags
so far, placing 6 novelty items (stickers, balloons, whistles, etc.) in each bag. You will
continue to make the bags using 6 items in each bag. Write a rule for the total number
of items used as a function of the number of bags created in addition to the first three.
How many novelty items will you use if you make 9 more bags?