You may be a bit rusty but your son should be taking this course now! Does he know the definitions of these things? Does he know what "domain" and "range" of a function mean? Does he know what "f' " means and how to find the derivative of a function? What does he know about "limits"? We are reluctant to do problems for people because you learn math by doing math, not by seeing someone else do it. (And it is very easy to watch someone solve a problem and fool your self into think that you now are able to do it.) And it won't help your son for you to do the problems for him.