Thread: Functions on varieties

Could someone take a look at any of exercies 4.3, 4.7, 4.8, 4.9 or 4.12 from this text and give me any pointers or hints in solving any of these exercises? I graduate next week and this is my last assignment! Thanks!

Undergraduate Algebraic Geometry - Google Book Search

Update: 2nd part of 4.3 is complete for n is odd.