Which of the following options results in a graph that shows exponential growth?

a. f(x) = 0.4(3)x

b. f(x) = 3(0.5)x

c. f(x) = 0.8(0.9)x

d. f(x) = 0.9(5)−x

Which of the following options results in a graph that shows exponential growth?

a. f(x) = 0.4(3)x

b. f(x) = 3(0.5)x

c. f(x) = 0.8(0.9)x

d. f(x) = 0.9(5)−x