I've uploaded solutions for chapters 3 and 4, .pdf and .tex. Actually, I didn't finish either chapter because I am lazy. The choice between video games and math is simple. Mostly done, though. Presumably I won't update these files again until May. It was a very good refresher for TeX skills, though. If anyone out there is bored and feels like writing some solutions, feel free.
POSTSCRIPT: Back to class Wednesday.