Suppose david has $65 to spend on his ticket and some shirts. he already spent $32.25 on his ticket and fee. write an inequality that could be used to find the maximum number of shirts he can buy.

There is not enough information to answer this. In order for me to tell you how many shirts he could buy with the money David has left, I would need to know how much a shirt costs- which isn't provided in the question. 

The only thing I can tell you is that he has $32.75 left.