## anonymous 4 years ago Which is a rational number? A. B. C. D.

1. anonymous

$A. \sqrt{8}$

2. anonymous

nope, $\sqrt{8}=2\sqrt{2}$ and $\sqrt{2}$is irrational

3. anonymous

$B. \sqrt{16}$

4. anonymous

in fact $$\sqrt{a}$$ is always irrational UNLESS $$a$$ is a perfect square, like for example 16

5. anonymous

$C.\sqrt{18}$

6. anonymous

$D.\sqrt{20}$

7. anonymous

16 i believe

8. anonymous

thank you

9. anonymous

wellcome~