Which functions are examples of exponential growth?

a) f(x) = 5^x

b) f(x) = (1/2)^x

c) f(x) = (1/2)^-x

d) f(x) = 3^-x

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A. `f(x)=5^x` example of exponential growth

C. `f(x)=(1/2)^(-x)=(2^(-1))^(-x)=2^x` example of exponential growth.

other two are examples of non-growth.

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