Classify the following numbers as rational or irrational :

$(i)$ $\sqrt{23}$

$(ii)$ $\sqrt{225}$

$(iii)$ $0.3796$

$(iv)$ $7.478478 \ldots$

$(v)$ $1.101001000100001 \ldots$

Represent $ \sqrt{9.3}$ on the number line.

Rationalise the denominators of the following :

$(i)$ $\frac{1}{\sqrt{7}}$

$(ii)$ $\frac{1}{\sqrt{7}-\sqrt{6}}$

$(iii)$ $\frac{1}{\sqrt{5}+\sqrt{2}}$

$(iv)$ $\frac{1}{\sqrt{7}-2}$

Find :

$(i)$ $2^{\frac{2}{3}} \cdot 2^{\frac{1}{5}}$

$(ii)$ $\left(\frac{1}{3^{3}}\right)^{7}$

$(iii)$ $\frac{11^{\frac{1}{2}}}{11^{\frac{1}{4}}}$

$(iv)$ $7^{\frac{1}{2}} \cdot 8^{\frac{1}{2}}$

Simplify the following expressions :

$(i)$ $(5+\sqrt{7})(2+\sqrt{5})$

$(ii)$ $(5+\sqrt{5})(5-\sqrt{5})$

$(iii)$ $(\sqrt{3}+\sqrt{7})^{2}$

$(iv)$ $(\sqrt{11}-\sqrt{7})(\sqrt{11}+\sqrt{7})$

Simplify

$(i)$ $2^{\frac{2}{3}} \cdot 2^{\frac{1}{3}}$

$(ii)$ $\left(3^{\frac{1}{5}}\right)^{4}$

$(iii)$ $\frac{7^{\frac{1}{5}}}{7^{\frac{1}{3}}}$

$(iv)$ $13^{\frac{1}{5}} \cdot 17^{\frac{1}{5}}$