Respuesta :

it would be
[tex]\sqrt{125} [/tex]
hope this will work though
First, let's make that denominator, 125, into a perfect square.  
Note that 5(125) = 625 = 25^2, a perfect square.
                                   5(13)          65
Rewrite 13/125 as -------------- = --------
                                  5(125)         625

Find the sqrt of 65/625:     It is sqrt(65) / 25    (ANSWER)