Answer
Correct choices are $A,C,D$
Work Step by Step
$$5^x=9$$
By definition of logarithm, the solution is:
$$x=\log_5 9$$
Using base change properties of logarithm, rewrite as:
$$\frac{\log9}{\log5}~~~~or~~~~\frac{\ln9}{\ln5}$$
Options $A$, $C$, $D$.
