Updated 11th edition, so you can work problems as you study. Solving problems as you go reinforces what you've learned and reveals where you may need additional review. Many of these problems are in the same multiple-choice format as the exam. Others are free-response, encouraging you to understand the concepts behind the answers. After you've attempted each problem, you can refer to the solution to check your work. Each solution takes you step by step through the process, providing a clear, complete explanation of how to reach the answer most efficiently.