Running the ipynb notebooks: Make sure the name of the file you get ends with .ipynb rather than .txt. To ensure this, right-click the link, and select the appropriate menu option. Alternatively, if you get a .txt file, manually rename it to remove the .txt at the end. Once downloaded in proper form, open sage/juptyer and find the file on the dashboard, and open it from there.
Collaboration Policy: You are welcome to work with others on this homework assignment. But the code and explanations you turn in should actually be written by you. In particular, you should not submit code that you copied from an email a friend sent you.