## 2yoututu11 3 years ago Which is a rational number? A. B. C. D.

1. 2yoututu11

$A. \sqrt{8}$

2. anonymous

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

3. 2yoututu11

$B. \sqrt{16}$

4. anonymous

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

5. 2yoututu11

$C.\sqrt{18}$

6. 2yoututu11

$D.\sqrt{20}$

16 i believe

8. 2yoututu11

thank you