Question 33119
Sqrt M^2/N^3 =  = M/N^2(Sqrt N) 
Yes, it is correct to that point.  Now you need to rationalize the denomintor.  If you have a square root in the denominator you aren't done.  
Multiply both the denominator and numerator by sqrtN to get that square root out of the denominator. 

{{{M * sqrt(N)/(N^2*sqrt(N)*sqrt(N))}}}
{{{M * sqrt(N)/(N^2*sqrt(N^2))}}}
{{{M * sqrt(N)/(N^2*N)}}}
{{{M * sqrt(N)/(N^3)}}}