Exercises are designed to reinforce essential ideas covered, while allowing you to assess whether you "got it." Accordingly, when presented with a question, you must select the best answer, and then click on the blue Check button. Next, you'll see whether you've answered correctly or incorrectly, along with a corresponding explanation. After clicking "Finish Quiz," please wait for your results to be recorded. Exercises are not graded, and you can always go back and restart the quiz.