Direction: What approximate value will come in place of the question mark (?) in the following question? (You are not expected to calculate the exact value)

(31.99)^1/5 × (80.78)^1/4 × (5.15)² = ? × 2.29

$$ \sqrt{0.00004761} $$   equal to

The least number, by which 1944 must be multiplied so as to make the result a perfect cube is 

The value of   $${(75.8)^2-(55.8)^2\over20}$$

The Value of $$ {\sqrt{6-\sqrt{17-2\sqrt{72}}}}$$ is closest to:

On simplification of   $$ {(2.664)^2-(2.356)^2\over0.288}$$

If $$ {0.7\over 1-6c}=-0.2$$ then what is the value of c.

If $${{k^2}\over {k^2-2k+1}}={1\over 6}$$, then what is the value of $${1\over k^3}+k3$$ ?