16.1 problem Example 7.7.1 page 381
 16.2 problem Example 7.7.2 page 383
 16.3 problem Example 7.7.3 page 385
 16.4 problem Example 7.7.4 page 387
 16.5 problem 1
 16.6 problem 2
 16.7 problem 3
 16.8 problem 4
 16.9 problem 5
 16.10 problem 6
 16.11 problem 7
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 16.15 problem 11
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 16.18 problem 14
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 16.44 problem 40