From the textbook:

2.1 #2,3,5,8
2.2 #2,3,6,8,11,20,32,34,41,46
2.3 #1,2,6,10,14,23,27,29,35,38,43,48,58
2.5 #3,7,9,11,19,23,25,34,36,42,46,47
2.6 #3,7,19,24,26,33,44,50
2.7 #4,10,11,14,20,27,31,34,36,40,44
2.8 #1,3,10,13,26,29,38,44,52
3.1 #4,10,20,23,24,31,35,46,54,58,74
3.2 #14,20,24,28,33,39,46,50