Solutions to certain textbook exercises

Collected here are assorted solutions to textbook exercises, focusing especially on exercises towards the end of the book. All work is original unless otherwise stated, and all errors are my own.

I find that my work tends to decrease in quality as the semester progresses, which coincides with material getting more difficult and requiring more thorough study to master. Therefore, doing exercises on the parts of classes that I may not have understood as well is a useful way to get better at math.