Question

classify root 21 as rational or irrational give reasons to support your answer​

Answer 1

Root 21 is an irrational number

Root21 =root 7×3

7 and 3 are prime

So root 21 is irrational

Answer 2

Answer:

under root 21 is an irrational number because under root 21=4.582

which is not a rationa number.