b) 3, ___, 27, 81, 243

c) 16, 32, 64, 128, ___

d) 2, 8, ___, 128, 512

e) 7, 21, 63, 189, ___

f) 5, 25, ___, 625, 3125

g)3.125, 12.5, 50, 200, ___

h) 2, 12, 72, ___, 2 592

i) 12.5, 100, 800, 6400, ___

j) 10, ___, 810, 7 290, 65 610