Hiya !
I need help. . .
Which of the following is a rational number?
[tex]\sf{a) \: \sqrt{20}}[/tex]
[tex]\sf{b) \: \pi}[/tex]
[tex]\sf{c) \: \sqrt{21}}[/tex]
[tex]\sf{d) \: \sqrt{25}}[/tex]
(remember no calculator if you're trying to use it)
→ Make an explanation to this. don't cheat!
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