Respuesta :

The function is

[tex]f(x)=\frac{1}{9}9^x=9^{-1}\cdot9^x=9^{x-1}[/tex]

To get f(3), set x=3 and solve, as follows:

[tex]f(x=3)=9^{3-1}=9^2=81[/tex]

Then, the answer is 81, option A

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