Question

Hurry please!

Choose the number that is rational.
A. √20
B. √32
C. √45
D. √64

Answer 1

By rational it means that which number can be expressed as a fraction, let's simplify and check each one.

Sqrt20=2*sqrt5

sqrt 5 is irrational

sqrt32=4sqrt2

sqrt2 is irrational

sqrt45=3sqrt5

sqrt5 is irrational

sqrt64=8

8 is rational!