Q: Is the square root of 20 a rational number or irational?

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The square root of an irational number must, itself, be irrational.

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The square root of 25 is 5 ... rational.

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The square root of 4 is 2. 2 is a rational number so they square root of 4 is rational.

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Yes. The square root of 81 is 9, which is a rational number.

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0.79 is a rational number but the square root of 23 is an irrational number

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