for those partice question could you help me and write it in paper step by step cause i really have no idea

Find all possible o E So such that of = (214 3 5 67). Justify your answer.Let G be an abelian group of order 16. Suppose there are x, y E G such that a = y = 4 but x2 / 2. Determine all possible isomorphism classes of G. Justify your answer.Let n > 2. Prove that the map o : U(2" ) -> U(2" ) given by b(g) = 93 is an automorphism. Hint: Find the order of U (2" ) first. Use that it's an abelian group