The exercises in this chapter are quite good, so I recommend doing them. Exercises 5.3 and 5.4 are the sort of thing I might put on an exam. On the other hand, they tend to be a little monotonous, so I am not going to assign them or collect them. Just do enough of them to convince yourself that you know what's going on. Or, if you don't, then you will know what to ask about.