the square root of 81/29.
Well, just take the sqrt of both numbers separately, so we have:
sqrt(81)=9
sqrt(29)=5.385165, So the answer is:
9/5.385165
$$\sqrt(81/29) = \sqrt(81)/\sqrt(29) = 9/\sqrt(29) = 9*\sqrt(29)/(\sqrt(29)*\sqrt(29)) = 9\sqrt(29)/29$$