$\sqrt{\frac{0.324 \times 0.081 \times 4.624}{1.5625 \times 0.0289 \times 72.9 \times 64}} = ?$

If $x=\frac{\sqrt{3}+1}{\sqrt{3}-1}$ and $y=\frac{\sqrt{3}-1}{\sqrt{3}+1},$ then the value of $(x^{2}+y^{2})$ is

The areas of two square fields are $420.25 \; m^2$ and $441 \; m^2,$ respectively. The ratio of their sides is

$A$ General wishing to draw up his $5180$ men in the form of a solid square found that he had $4$ men less. If he could get four more men and form the solid square,the number of men in the front row is

If $\sqrt{1+\frac{55}{729}}=1+\frac{x}{27},$ then the value of $x$ is

$\sqrt{12+\sqrt{12+\sqrt{12+\cdots}}} = ?$