Decimal representation of a rational number cannot be

Find the value

$\frac{4}{(216)^{-\frac{2}{3}}}+\frac{1}{(256)^{-\frac{3}{4}}}+\frac{2}{(243)^{-\frac{1}{5}}}$

Fill in the blanks so as to make each of the following statements true (Final answer only)

Square root of $121$ is ..........

Rationalise the denominator in each of the following

$\frac{18}{3 \sqrt{2}-2 \sqrt{3}}$

If $x=\frac{\sqrt{3}+\sqrt{2}}{\sqrt{3}-\sqrt{2}}$ and $y=\frac{\sqrt{3}-\sqrt{2}}{\sqrt{3}+\sqrt{2}},$ then find the value of $x^{2}+y^{2}$.

Arrange the following numbers in the ascending order

$\sqrt{3}, \sqrt[3]{4}, \sqrt[4]{10}$