b) 7 - 3 = 4
c) 12 + 13 = 25
d) [tex]2^{3}[/tex] * 4 + [tex]3^{2}[/tex] * 2 = 8 * 4 + 9 * 2 = 32 + 18 = 50
e) [tex]10^{3}[/tex] * 5 - [tex]5^{2}[/tex] * 2 = 1000 * 5 - 25 * 2 = 5000 - 50 = 4950
