Question 322639
To rationalize the denominator of a fraction, we need to re-write the fraction so that our new fraction has the same value as the original, and has a rational denominator.  The standard method of changing a fraction into an equivalent fraction with a specified denominator is to multiply it by some number over itself - often picking the number that is the irrational part of the denominator.
In this case, you want to multiply the original fraction by (sqrt(12))/((sqrt(12)). 
So:
(6/(sqrt(12))*(((sqrt(12))/((sqrt(12)))
(6*(sqrt(12))/12
This is your answer because the denominator is now rationalized.