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Adding a few missing solutions, and corrected one mistake.
I haven't compiled it locally, so you'll want to double check that things render correctly. But the solutions I added were very similar to problems you'd already written solutions for, so I was able to reuse most of the tex code.
I also have a question: For problem
3.1.28
part a, is it true that zero is a positive real number? I didn’t think zero was positive?