Resposta:
f(x) = 3*2^x
g(x) = 3^x - 5
h(x) = 3^(2x-1)
a) f(1) = 3*2 = 6
b) f(0) = 3
c) g(2) = 9 - 5 = 4
d) h(2) = 3^(4 - 1) = 27
e) f(-3) = 3/8
f) g(0) = 1 - 5 = -4
g) h(-2) = 3^(-5) = 1/243
h) f(-4) = 3/16
