# Is 18 an irrational?

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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.
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# Is the square root of 18 irrational or a rational number?

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

# Is negative 18 rational or irrational?

-18 is the ratio of -18 and 1 ... nice and rational. Also the ratio of 18 and -1, of 36 and -2, of 180 and -10, etc.

# Is 18 an irrational number?

yes it is an irrational number No because 18 is a rational number

# Is -18 an irrational number?

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.

# Is the square root of 18 a rational or irrational number?

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

Rational.

# Is 18 a real number Is it raional or irrational?

Integers (whole numbers, without a decimal point, including negative whole numbers) are real numbers; they are rational; therefore they are not irrational.

# Is 18 rational or irrational?

18 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.

# Is 18 divided by 71 an irrational number?

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

# Is the square root of negative 18 rational or irrational?

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

# Is negative 18 over 6 an irrational number?

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

# Is the square root of 18 an irrational nummber?

Yes because it can't be expressed as a fraction

Yes
In Algebra

# Is the square root of 18 an irrational number?

Yes because it can't be expressed as a fraction.
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# What is 4 18 is it rational or irrational?

It is a rational number
In Algebra

# Is the square root of 18 halves a rational or irrational number?

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