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Is the sum of 4.2 and the square root of 2 rational or irrational?
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Is the sum of 4.2 and the square root of 2 rational or irrational?

User Asaaki
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A rational number can be expressed as a fraction with an integer numerator and denominator. The square root of 2 is irrational, and adding 4.2 doesn't change this, since there are no integers that, when divided, form this sum.
User Vu Truong
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