The 15th edition etext and the HW system is provided free of charge from our class Canvas page. The instructions for accessing the etext and the HW system are now provided by Pearson. Here is that link: How to Access the HW System with Etext During the sign-up process, you will be prompted to enter your ASU Posting ID. Be sure to enter your correct ASU Posting ID, which is 4 digits, followed by a hyphen, followed by 3 digits. If you do not enter the correct ASU Posting ID, you will never get credit for your work at Mastering Physics. What if I don't know my ASU Posting ID? Please see the tips for using Mastering Physics.