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03-11-2015
Mathematics

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Simplify the radical expression by rationalizing the denominator.
4 divided by the square root of 21.

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03-11-2015

[tex]\frac{4}{\sqrt{21}} = \frac{4}{\sqrt{21}} \times \frac{\sqrt{21}}{\sqrt{21}} =\boxed{ \frac{4\sqrt{21}}{21}}[/tex]

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