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

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

 $$6 {4\over 9}$$ % ..???kkk

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

If $$ {\sqrt{4^{n}}=1024}$$, then the value of n is:

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 :

Find the value of $$ {\sqrt{4+\sqrt{44+\sqrt{10000}}}}$$.