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Q: Is 18 an irrational number

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The square root of 18 is an irrational number because it cannot be expressed as a fraction.

No. √324 = 18 = 18/1 = a rational number.

The sum of a rational and irrational number must be an irrational number.

rational * irrational = irrational.

No, 3.56 is not an irrational number. 3.56 is rational.

Related questions

The square root of 18 is an irrational number because it cannot be expressed as a fraction.

Yes

It is a rational number

It is neither because the square root of -18 is an imaginary number but the square root of 18 is irrational

The square root of (any number that isn't a perfect square) is irrational.

No. If you can write the number on paper, it's rational. -18 is the ratio of -18 to 1, and also the ratio of 18 to -1.

No. √324 = 18 = 18/1 = a rational number.

No. An irrational number cannot be expressed as a/b where a and b are integers, b not zero. 18 = 18/1 = 36/2 = -36/-2 etc.

18 and 20

Rational.

sqrt(18) = 3*sqrt(2) is an irrational number.

No. It can be written as a fraction, so it is rational.

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