Answers to the 2008 AP Calculus AB Multiple Choice can be found for sale at College Board, the maker of the test; they can also be found for free on many individual websites. College Board offers the official answers with complete explanations in their 2008 Complete AB Released Exam.
The cost to purchase the 2008 Calculus AB released exam materials is $42.00 through the parent company as of August 2014. Many individuals have also uploaded copies of the answers to various websites. Having thorough explanations for answers can be an excellent method for study and practice in preparation for taking the AP Calculus exam by helping students to better understand how they erred in practice problems.