Need help with sets and subsets problem.

Define the following sets as: A = {a e Z: 3 is an integer multiple of 3} B = {x Z :x is a perfect square) C = {4, 5, 9, 10} D = {2, 4, 11, 14} E = {3, 6, 9} F= {4, 9, 16} What are the following sets? Express your answer by listing the elements in curly braces. You can assume the universal set is Z. ENF . b. C-B BAD C. d. n(CUD) e. DIE