Please check the ISBN that your instructor provided. If the ISBN-13 does not match this product (9781285445427) this may not be the correct product. In some cases, you may also require a course code from your Instructor.Millions of students use Aplia to better prepare for class and for their exams. Aplia assignments mean "no surprises"--with an at-a-glance view of current assignments organized by due date, you always know what's due, and when. Aplia ties your lessons into real-world applications so you get a bigger, better picture of how you'll use your education in your future workplace and automatic grading and immediate feedback helps you master content the right way the first time.Instructor Assigned: Please be aware that the product you are purchasing is usable only if assigned by your instructor. If your instructor has not assigned this product, you should not continue with your purchase.