Find the square root of  $$ {k+l+m+n+2\sqrt{ml+mk}+2\sqrt{mn}+2\sqrt{kn+ln}}$$

if the square root of 841 is 29, then square root of 0.0000084 is equal to: 

What is the value of positive square root of $$\ 14+ 6\sqrt{5}\ $$?

The sum of square of two number is 68 and square of the different of them is 36. Then multiplication value of two is.

The square root of 7744 is :

 $$6 {4\over 9}$$ % ..???kkk

The value of $$ \sqrt { 2^4} \ + \ ^{3}\sqrt {64} \  + \ ^4\sqrt { 2^8} \    $$ is :

If $$ {3^{a+3}×4^{a+6}×25^{a+1}\over{27}^{a-1}×8^{a-2}×125^{a+4}}={4\over15^{26}}$$ then the value of $$ {\sqrt{a+9}}$$.