# Choose the correct letter. Which of the following functions models exponential decay? A.f(x)=12*3^x B. y=2*0.8^x C. y=-3x^2 D. f(x)=1.8^x

Choose the correct letter. Which of the following functions models exponential decay?

A. $f\left(x\right)=12\ast {3}^{x}$

B. $y=2\ast {0.8}^{x}$

C. $y=-3{x}^{2}$

D. $f\left(x\right)={1.8}^{x}$

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Lacey-May Snyder

1. The exponential function: $y=a\cdot {b}^{x}$ is an exponential growth if $b>1$ or is an exponential decay if 0 A:b=3
B:b=0.8
C: Not an exponential function
D:b=1.8