Mathematics, 01.06.2021 22:40, cferguson

Which expression results in a rational number? 1)
2)
3)
4)
PLS HELP :)

$\sqrt{121} - \sqrt{21}$
$\sqrt{25} \times \sqrt{50}$
$\sqrt{36} + \sqrt{225}$
$3 \sqrt{5} + 2 \sqrt{5}$

Answers: 3

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Which expression results in a rational number? 1)

2)

3)

4)
...