I'd considered putting all solutions on the web, but decided against it (because some professors may want to keep the solutions a secret!). I'll post solutions to those graded problems which were not in the back of the book. Feel free to have a look at the solutions manual, which can be found in my office.
Section 1.3: 8(a,b,c), 9(a,b,c,d), 12(a,b,c,d)
Section 1.4: 9, 11, 20 (you got lucky and two of them were in the back!)