$\frac{\sqrt{0.0009}}{\sqrt{0.01}} = ?$

Given that $\sqrt{4096} = 64$,the value of $\sqrt{4096} + \sqrt{40.96} + \sqrt{0.004096}$ is

$\sqrt{1.5625} = ?$

If $\frac{\sqrt{256}}{\sqrt{x}}=2,$ then $x$ is equal to

The value of $\frac{1+\sqrt{0.04}}{1-\sqrt{0.1}}$ is nearly equal to

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