$\sqrt{80} + 3\sqrt{245} - \sqrt{125} = ?$

If $0.13 \div p^{2} = 13$,then $p$ equals

$8787 \div 343 \times \sqrt{50} = ?$

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

If $a = 0.1039,$ then the value of $\sqrt{4a^{2} - 4a + 1} + 3a$ is

$1.5^{2} \times \sqrt{0.0225} = ?$