Question

I need help on this!

which of the following is an irrational number?

A. √1
B. √9
C. √45
D. √81

Answer 1

C sqrt(45) is irrational

Sqrt(1)=1 rational

Sqrt(9)=3 rational

Sqrt(81)=9 rational

Sqrt(45)=9*sqrt(5) irrational

So C sqrt(45) is the answer

Hope this helped. Have a great day!