Which of the following is an exponential function? a) f(x)=5x-6 b) f(x)=2/x c) f(x)=3x^3 d) f(x)=3^x

Which of the following is an exponential function?

a) f(x)=5x-6
b) f(x)=2/x
c) f(x)=3x^3
d) f(x)=3^x

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