It is essential that you use the symbol " ^ " to denote exponention. See the following changes I have made.
9u^2v and which term or terms are like terms? 15u^2v. Why? because both have "u^2" in them.
A(42) = 3(42) - 8
The 42nd term is 118.
I think the person on top got you with the answer
She will likely finish the graduation sessions in less time.