Answer
$\frac{7\sqrt {5n}}{5n}$
Work Step by Step
Step 1: $\frac{7}{\sqrt {5n}}$
Step 2: Rationalize the denominator: $\frac{7}{\sqrt {5n}}\times\frac{\sqrt {5n}}{\sqrt {5n}}$.
Step 3: Simplify: $\frac{7\times\sqrt {5n}}{\sqrt {5n}\times\sqrt {5n}}=\frac{7\sqrt {5n}}{5n}$.
