Which number is IRRATIONAL

because when you look for the root of ninety, it gives you a result that is not a natural or Rational number, but a completely Irrational number.

the result is 9.4868329

are numbers that cannot be expressed as the ratio of two whole numbers. This is opposed to rational numbers, like 2, 7, one-fifth and -13/9, which can be, and are, expressed as the ratio of two whole numbers.

hope this help!!

i think asking google will you get the answer to that question