Note: Numerical answers will usually only be worked out to 1 digit accuracy. Using a calculator to get an answer causes me ennui. Also note that the questions were originally written in the TeX mark-up language, not in html (hyper-text mark-up language), and an exact translation to html is not yet possible. Some TeXisms remain, but students should be able to interpret them. I'd be grateful, reader, if you call any mistakes to my attention.