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.
Sqrt(18/2) =Sqrt(9) =3 which is rational.
-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.
-18 is a rational number
The square root of 18 is not a rational number because it cannot be expressed as a fraction of two integers. The square root of 18 is approximately 4.2426, which is an irrational number. Irrational numbers cannot be expressed as a simple fraction or ratio of two integers, unlike rational numbers.
It is a rational number
The fraction 12/18 can be simplified to 2/3 by dividing both the numerator and denominator by their greatest common divisor, which is 6. Since the fraction 2/3 can be expressed as a ratio of two integers and can be written in the form a/b where a and b are integers and b is not equal to 0, it is considered a rational number. Rational numbers are numbers that can be expressed as a ratio of two integers.
-18
Yes. sqrt(2) and sqrt(18) = 3*sqrt(2) are both irrational. But their product is sqrt(2)*3*sqrt(2) = 3*2 = 6 which is rational.
Yes
1/2, -3/5, 16/97, 15/2, -18/7
Yes
Yes.