Jill has been watching the squirrels that live in her neighborhood. the number of squirrels changes each week.

n f(n)

1 8
2 12
3 18
4 27

which function best shows the relationship between n and f(n)?

a f(n) = 12(1.5)n
b f(n) = 12(1.5)n−1
c f(n) = 8(1.5)n
d f(n) = 8(1.5)n−1