Question

Could you help me with this is from apex please

Answer 1

The function is

$f(x)=\frac{1}{9}9^x=9^{-1}\cdot9^x=9^{x-1}$

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

$f(x=3)=9^{3-1}=9^2=81$

Then, the answer is 81, option A