The square root of $(7+3 \sqrt{5})(7-3 \sqrt{5})$ is

$\sqrt{6354} \times 34.993 = ?$

If $\frac{52}{x} = \sqrt{\frac{169}{289}}$,then the value of $x$ is

In the following questions,two equations numbered $I$ and $II$ are given. You have to solve both the equations and give the answer.
$I$: $(625)^{\frac{1}{4}} x + \sqrt{1225} = 155$
$II$: $\sqrt{196} y + 13 = 279$

$A$ general wishing to draw up his $16160$ men in the form of a solid square found that he had $31$ men over. The number of men in the front row is:

If $a^{2}=2,$ then $(a+1)$ is equal to