Please Help

Give the smallest big-O estimate for the following functions: To express exponents use the form n m to indicate nm. Only put spaces after log's. For example, if your answer is (n-n!)- log n then you'll enter (n^2n!)^2log n a. (n2 + 8)(n 1) b. (n log n n2)(n3 2) c. (n! + 2")(n3 + log (n 1)) d. (n3 + n2 log n)(log n + 1)(17 log n + 19)(n3 + 2)