Final Exam Review

I would like to talk about the meaning of cosets in class. I think that understanding cosets in rings and right and left cosets in groups would help me to understand better the theorems that deal with them. I would also like to go over quotient rings and quotient groups. I would like to know how to prove things about quotient groups--for example, problems 18, 24, 25, and 27 of section 7.7.