a) 8^6 / 8^4 = 8^(6-4) = 8^2 = 64
b) 0.8^7 / 0.8^4 = 0.8^(7-4) = 0.8^3 = 0.512
v) (-0.3)^5 / (-0.3)^3 = (-0.3)^(5-3) = (-0.3)^2 = 0.09
g) (1 1/2)^4 / (1 1/2)^2 = (3/2)^4 / (3/2)^2 = (3/2)^(4-2) = (3/2)^2 = 9/4 = 2.25
d) (-2 1/3)^5 / (-2 1/3)^3 = (-7/3)^5 / (-7/3)^3 = (-7/3)^(5-3) = (-7/3)^2 = 49/9 = 5.444...