Rationalising the denominator by Boxed Rockets

Rationalise the Denominator

\frac{4}{\sqrt{10}}

\frac{2 \sqrt{10}}{5}

\frac{2}{3 \sqrt{6}}

\frac{\sqrt{6}}{9}

\frac{4 + \sqrt{7}}{\sqrt{7}}

\frac{4 \sqrt{7} + 7}{7}

\frac{3 - 4 \sqrt{5}}{\sqrt{5}}

\frac{3 \sqrt{5} - 20}{5}