10.1 problem 1
 10.2 problem 2
 10.3 problem 3
 10.4 problem 4
 10.5 problem 5
 10.6 problem 6
 10.7 problem 7
 10.8 problem 8
 10.9 problem 9
 10.10 problem 10
 10.11 problem 11
 10.12 problem 11
 10.13 problem 12
 10.14 problem 13
 10.15 problem 14
 10.16 problem 15
 10.17 problem 16
 10.18 problem 19
 10.19 problem 20
 10.20 problem 21
 10.21 problem 22
 10.22 problem 23
 10.23 problem 24
 10.24 problem 25
 10.25 problem 26
 10.26 problem 27
 10.27 problem 28
 10.28 problem 29
 10.29 problem 30
 10.30 problem 33
 10.31 problem 34
 10.32 problem 35
 10.33 problem 36
 10.34 problem 37
 10.35 problem 38
 10.36 problem 39
 10.37 problem 40
 10.38 problem 45