Question 186769
{{{sqrt(5)}}} is irrational (since it CANNOT be written as a fraction of integers)



{{{sqrt(9)=3}}} which is rational since {{{3=3/1}}}



{{{sqrt(-1)=i}}} which is complex (ie not real)



{{{sqrt(2/3)=sqrt(2)/sqrt(3)=(sqrt(2)sqrt(3))/(sqrt(3)sqrt(3))=sqrt(6)/3}}} is irrational as it can't be written as a fraction of 2 integers.