Guys i really need help in these three problems. If someone could explain how to do this i would appreciate it!

Question

complete and balance the following equations

1. SO3^2- + Cu^2+ --> SO4^2- + Cu^+
2. Cr +Cu^2+ ---> CrO4^2- + Cu^+
3. MnO2 + Ag^+ ---> MnO4^- + Ag

Answer 1

See your post above.