$\frac{\sqrt{6727}}{\sqrt{7}} = ?$

$\frac{1}{\sqrt{9}-\sqrt{8}} = ?$

In the following questions,two equations numbered $I$ and $II$ are given. You have to solve both the equations and give the answer.
$I: \frac{13}{\sqrt{x}} + \frac{9}{\sqrt{x}} = \sqrt{x}$
$II: y^4 - \frac{(13 \times 2)^{9/2}}{\sqrt{y}} = 0$

If $\sqrt{1+\sqrt{1-\frac{2176}{2401}}}=1+\frac{x}{7},$ the value of $x$ is

The value of $\sqrt{0.01} + \sqrt{0.81} + \sqrt{1.21} + \sqrt{0.0009}$ is

$\sqrt{\frac{0.081 \times 0.484}{0.0064 \times 6.25}}$ is equal to