# 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. $$f(x)=12*3^x$$

B. $$y=2*0.8^x$$

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

D. $$f(x)=1.8^x$$

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Lacey-May Snyder

1. The exponential function: $$\displaystyle{y}={a}\cdot{b}^{{x}}$$ 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