Comments/answers for quizzes and tests
Comments and answers for Quiz 0
Comments and answers for Quiz 1
Comments and answers for Quiz 2
Comments and answers for Quiz 3
Quiz 4    Comments and answers for Quiz 4
Comments and answers for Quiz 5
Review sheet for Test 1
Comments and answers for Test 1
Comments and answers for Quiz 6
Comments and answers for Quiz 7
Quiz 8 (for practice)   
Comments and answers for Quiz 8
Comments and answers for Quiz 9
Review sheet for Test 2
Comments and answers for Test 2
Comments and answers for Quiz 10
Comments and answers for Quiz 11
Comments and answers for Quiz 12
Comments and answers for Pop Quiz A
Integral practice (class activity)   
Answers to integral practice
Review sheet for Test 3 (and beyond)
A good source of practice problems is your book. Odd problems typically have answers. Some of the odd problems also have detailed solutions (see the PDF in the same place you find your chapters).
Here are some suggested problems from the book.