7.
b)
[tex] {2}^{4} + {2}^{3} = 24[/tex]
c)
[tex] {2}^{5} + {2}^{4} + {2}^{0} = 49[/tex]
d)
[tex] {2}^{6} + {2}^{0} = 65[/tex]
8.
b)
[tex] {3}^{4} < 100 < {3}^{5} [/tex]
[tex] {3}^{6} < 1000 < {3}^{7} [/tex]
n e {5,6}
c)
[tex] {7}^{1} < 45 < {7}^{2} [/tex]
[tex] {7}^{3} < 2403 < {7}^{4} [/tex]
n e {2,3}
