Problem 1.   Boas Problem #3, Ch.11.9, page 548. 

Problem 2.   Boas Problem #4, Ch.11.9, page 548.

Problem 3.   Boas Problem #6, Ch.11.9, page 549.

Problem 4.   Boas Problem #2, Ch.11.10, page 551.

Problem 5.   Boas Problem #4, Ch.11.10, page 552.

Problem 6.   Boas Problem #7, Ch.11.10, page 552.