MATH
posted by keke .
Which of the following numbers is irrational?
A 5/9
B 3.15
C /5
D 8.341
I THINK IT A

CAN SOMEBODY HELP ME

a rational number can be written as a fraction.
Any terminating or repeating decimal is also rational.
√5 is not rational. There is no fraction which is exactly equal to √5. The decimal value goes on forever and never repeats.
It is easy to prove that √5 is irrational, if you are interested. Just google proofs for √2 and follow the same logic you find there. 
so it c