**Question 1: **Compute the fourth root of $\sqrt[4]{28561}$

** Solution: **
Given number is $\sqrt[4]{28561}$. Express it in terms of power of 4 to get

$\sqrt[4]{28561}$ = (13^{4})^{1/4} = 13

$\therefore$ $\sqrt[4]{28561}$ = 13

**Question 2: **Compute the following: $\sqrt[4]{81}$

** Solution: **
Given number is $\sqrt[4]{81}$.

Express it in terms of power of 4 to get

$\sqrt[4]{81}$ = (3^{4})^{1/4} = 3

$\therefore$ $\sqrt[4]{81}$ = 3