Your ID number is used to register your successes and to view your progress
The machine-graded assignments have due-dates indicated. If you complete them on time you get full credit. If you are late, the amount of credit you get for completion decreases to half credit at two weeks late. There will be no credit for completion after more than two weeks.
Some other gadgets that may be of independent interest:
A grapher .
And a comparison gadget to test whether two expressions are essentially equal: this can be used to test whether trig identities are correct, and other things.
My motivation in making the things here is to help you learn how to do mathematics. We didn't just buy this software somewhere, I made it. The fact that I spent a lot of time and energy here should give you the idea that I am committed to having it be genuinely helpful. It's not just for appearances or to be cool (although coolness would be ok, too). If something seems to be broken, please let me know. At the same time, it has already been used twice, and I think all the answers are correct, and it basically works, so don't be too eager to find problems. ;-)