Which of the following is a rational number? square root 15 square root 16, square root 21, square root 22 square root 15 square root 16 square root 21 square root 22

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Which of the following is a rational number? square root 15 square root 16, square root 21, square root 22 square root 15 square root 16 square root 21 square root 22

Mathematics
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hint: \[\Large 16 = {4^2}\] whereas 15, 21, and 22 are not perfect squares
so we can write: \[\Large \sqrt {16} = 4 = \frac{4}{1}\]
for example we can not find a pair of positive integer, say m and n, such that \[\Large \sqrt {21} = \frac{m}{n}\] with n different from zero

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integers*
sorry
no worries! :) what is the right option?
so the answer is 16
better is square root of 16
yes square root 16 is the right answer (:
correct!
i knew it was the right answer cause thats what i had
ok!

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