Which function represents exponential decay?

a. f(x) =1/2 (3/2)^x

b. f(x) =1/2 (-3/2)^x

c. f(x) =4 (-2/3)^x

d. f(x) = 4 (2/3)^x

Which function represents exponential decay?

a. f(x) =1/2 (3/2)^x

b. f(x) =1/2 (-3/2)^x

c. f(x) =4 (-2/3)^x

d. f(x) = 4 (2/3)^x