> Do you have the answers to the rest of your course? I > am completing that course and need some help on how > to do some of the problems. > > Then I strongly recommend that both of you open your textbooks and learn the DEFINITIONS. Definitions in mathematics are "working" definitions- you use the precise words in the definitions in proofs and solving problems. Definitions must be learned by heart. If you know what "perpendicular" means, the first question is trivial.