(1) Can DrRacket be installed on a Chromebook? (2) If so, are there simple instructions somewhere for this that I can send to one of my students who is asking? Thank you for any advice in this!

According to https://lists.racket-lang.org/users/archive/2015-January/065777.html, the following should work:

1. Open terminal
2. Run sudo add-apt-repository ppa:plt/racket
3. Run sudo apt-get update
4. Run sudo apt-get install racket

Thank you! I will ask the student to give this a try.