all of the above besides: square root of 4/4
They are irrational if you can't get an even answer
\sqrt{1/4} = rational because its 1/2
\sqrt{2/4} = irrational
\sqrt{3/4} = irrational
\sqrt{4/4} = rational because its 2/2 = 1
\sqrt{5/4} = irrational
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