An irrational number is a number which cannot be expressed as a fraction made of integers. These numbers generally have infinite decimals with no pattern to them whatsoever. The easiest way, I think, to make an irrational number is to take the square root of a number between the squares of your parameters, in this case between 64 and 81. Thus a number such as square root(72), which is 8.485281..., or square root(80), which is 8.944571..., will do nicely.
No, because an integer is a whole number and it's opposite (negative or positive). The square root of 80 is not a whole number.
Square root of 81
no. 80 is a rational number
A negative number cannot have a square root in basic mathematics. However, in more advanced mathematics, you will study complex numbers. And there you will find that the square roots of -80 are Â± 8.944*i where i is the imaginary square root of -1.Incidentally, Â± 8.944 are the square roots of +80.
-80 is a rational number
√80 = 8.94427191
square root of 125/80 = 1.25 or 5/4
No because -80 is a rational number