what is the value of $log_{3}81$?\no 2\no 3\no 4\no 5

Explanation:

Step1: Recall logarithm definition

If $y = \log_{a}x$, then $a^{y}=x$. Let $y=\log_{3}81$, so $3^{y}=81$.

Step2: Express 81 as a power of 3

We know that $3\times3\times3\times3 = 3^{4}=81$.

Answer:

C. 4