Amazon.com description: Product Description: Students save money by purchasing this bundle which includes Essential Calculus: Early Transcendentals, 2nd Edition and access to Enhanced WebAssign Homework with eBook for Multi-Term Math and Science via Printed Access Card. This access is for the Calculus course only as using with a different course may cause complications with access. Enhanced WebAssign engages you with immediate feedback, rich tutorial content, and an interactive, fully customizable eBook, Cengage YouBook helping you to develop a deeper conceptual understanding of your subject matter. This access code includes access to Enhanced WebAssign and life-of-edition access to the eBook for the registered edition of that text. If you need to retake the course and your instructor is using the same book AND edition then you will not need to buy a new code.