Problem 1.   Boas Problem #8, Ch.10.5, page 513.

Problem 2.   Boas Problem #10, Ch.10.5, page 513.

Problem 3.   Boas Problem #12(c), Ch.10.5, page 514.

Problem 4.   Boas Problems #9, 10, 11, 12, 13, 14, Ch.10.6, page 517.