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Please check the ISBN that your instructor provided. If the ISNB-13 does not match this product (9781133366775) or its Printed Access Card equivalent (9781133366669) this may not be the correct product. In some cases, you may also require a course code from your Instructor. Have the tools you need to be successful -- A variety of tools are available in CengageNOW, all combined in one easy-to-use resource designed to improve your grades. Some resources get you prepared for class and help you succeed on homework, and others show you specific areas where you can work to improve. 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.