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

Find the least number,which,when multiplied with $74088$ will make it a perfect square.

In the following questions,two equations numbered $I$ and $II$ are given. You have to solve both the equations and give the answer.
$I$: $\frac{5}{7} - \frac{5}{21} = \frac{\sqrt{x}}{42}$
$II$: $\frac{\sqrt{y}}{4} + \frac{\sqrt{y}}{16} = \frac{250}{\sqrt{y}}$

$\frac{250}{\sqrt{?}}=10$

If $\sqrt{2} = 1.414$,the square root of $\frac{\sqrt{2}-1}{\sqrt{2}+1}$ is nearest to

If $\sqrt{15625} = 125$,then the value of $\sqrt{15625} + \sqrt{156.25} + \sqrt{1.5625}$ is