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Q: Is 18 over four a rational number?

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Rational.

-18 is a rational number

It is a rational number

Yes it is.

Yes - any whole number - even a negative number - is a rational number.

Yes, any number that can be expressed as a fraction is rational. Since 18 out of 2 is the same as 18/2, it is rational.

No. It is -3 and can be written as a fraction, so it is rational.

Yes.

yes it is an irrational numberNo because 18 is a rational number

Yes.

18 is the ratio of 18 to 1. It's completely rational.

Sqrt(18/2) =Sqrt(9) =3 which is rational.

The number, in the form of a ratio, is 18/100.

Yes. 18 is all of those things.

It is all of them.

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.

18/10

A number that is seventy four when it is subtracted by 18 is 92

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

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

I am Number Four was released on 02/18/2011.

Any terminating or non-terminating decimal digit is rational. The easiest way to look at this is, writing the number in the fractional from. 0.18 can be written as 18/100. Now, by the definition of a rational from, 18/100 is of the standard "p/q" from where q is not equal to 0 (q=100 here). Thus, it is a rational number.

18 is a factor of 36. 36 is a square. 18 is not.

Yes. Any terminating decimal is a rational number. Any repeating decimal also.