IMPORTANT: This instant access code includes access to WebAssign for only one term. When purchasing please ensure that you are using it for ONLY ONE TERM of the following course areas: Calculus, Physics or Chemistry. Use with a different course may cause complications with access. This code will NOT allow access beyond one semester. 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 the subject matter. This instant access code will be delivered via email when purchased. If you are not certain this is the correct access code for your course, please contact your instructor.