Question

Which equations represent decreasing exponential functions? Select all that apply.
A. f(x) = 8(0.64)^0.5x
B. f(x) = 4(0.45)^x
C. f(x) = 0.75^x
D. f(x) = 5(1.2)^2x
E. f(x) = 0.5(0.9)^5x
F. f(x) = 2.5^3x

Answer 1

wrong: A,B,C,E
they are the functions ab^(kx) with b<1 and k>0

Answer 2

C. f(x) = 0.75^x
D. f(x) = 5(1.2)^2x
E. f(x) = 0.5(0.9)^5x

Answer 3

Apologies for the incorrect response.
The correct equations that represent decreasing exponential functions are:

B. f(x) = 4(0.45)^x
D. f(x) = 5(1.2)^2x
F. f(x) = 2.5^3x