Find the cube root of the following decimal number: $54.872$

Find the square root of $6889$ by using Dwandwa Yoga Method.

Consider the following numbers:

$$\begin{gathered} 1. 2222 \\ 2. 11664 \\ 3. 343343 \\ 4. 220347 \end{gathered}$$

Which of the above are not perfect squares?

Arrange the following in the descending order $\left(\sqrt{23}-\sqrt{21}), (\sqrt{19}-\sqrt{17}), (\sqrt{21}-\sqrt{19}\right)$.

If $\sqrt[3]{\frac{\mathrm{a}}{\mathrm{b}}}=$$\frac{\sqrt[k]{a}}{\sqrt[k]{b}}$, then $k=$_____.

Evaluate: $\sqrt[3]{\frac{-27}{125}}$

If $\sqrt[3]{\frac{512}{x}}=\frac{8}{13}$, then $x=$_____.

Evaluate: $\sqrt[3]{\frac{729}{1000}}$

Evaluate: $\sqrt[3]{\frac{-64}{343}}$