$6.1 8, 12, 14, 29, 36, 42, 51
$6.2 6, 10, 14, 26, 30, none, 35, 40
$6.3 2, 10, 11, 16, 18, 25, 28, 34, 36
$7.2 none, none, 8, 10, 21, 24
$6.6 5, 14, 15, 24, 35 + $6.7 9, 13
$6.4 14, 16, 18, 22, 24, 31, 33, 42, 44
The problem list is ordered according to the order of homework in our textbook.