The rational number is the number you can write it in the form of the fraction
Ex: 1 , 5, 22/50, 1.25, 23.5468, square root 16, ........
The irrational number is the number you can not write it in the form of the fraction
Ex:
[tex]\sqrt[]{5},\sqrt[3]{24},\text{ }\pi,\text{ }[/tex]
or any approximated value
So in the question, the equation is
[tex](6)(3\pi)=18\pi[/tex]
6 is a rational number
3pi is an irrational number
rational * irrational = irrational
So the right answer is (B)
