MATH QUESTION IM STUCK ON

Question

Which # is irrational?

Question 18 options:

√9


2.78


3.1415978...


1/2

Answer 1

An irrational number is one that cannot be expressed as the ration of two numbers.  Pi, or 3.1415978... is actually irrational.  I know it sometimes is described as 22/7, but that ratio only gets close to pi.