Question

Which answer choice shows that the set of irrational numbers is not closed under addition?​

Answer 1

pi + -pi = 0

Explanation:

We need to have irrational numbers that we are adding and end up with a rational number. This means that it is not closed under addition

pi is an irrational number

0 is a rational number

pi + -pi = 0

irrational + irrational = rational