$\frac{47}{500}$ has $\ldots$ digits after the decimal point in its terminating decimal expansion.

$\sqrt{7+2 \sqrt{5}} = \dots$

If $HCF(a, b) = 1$,then $HCF(a - b, a + b)$ is equal to:

Find the square root of the expression $56-24 \sqrt{5}$ in the form of a binomial surd.

Find the square root of $3-\sqrt{5}$.

Without actually performing the long division,state whether the following rational number will have a terminating decimal expansion or a non-terminating repeating decimal expansion: $\frac{129}{2^{2} \cdot 5^{7} \cdot 7^{5}}$