Section 7.1.1: Prove equation (6) from truth tables.
Section 7.1.1: Explain the 80 in Table 4.
Section 7.1.1: Exercise 10. Note that this leads into the next couple
of exercises --- try to at least read them.
Section 7.1.1: Exercise 44.
Yes, the answers to the last two are in the book already.
Your job is to fill in any missing steps, expanding upon
Knuth's answer. Or, you can solve it in some new way.