Problem 1.   Boas Problem #1, Ch.11.11, page 553. 

Problem 2.   Boas Problem #3, Ch.11.11, page 554.

Problem 3.   Boas Problem #8, Ch.11.11, page 554.

Problem 4.   Boas Problem #1, Ch.11.12, page 558.

Problem 5.   Boas Problem #14, Ch.11.12, page 559.

Problem 6.   Boas Problem #4, Ch.12.1, page 564.