-39 has no rational roots.
It isn't. All integers are rational numbers.
If there are no numbers after the 9 it is rational
No, they are not.
No, they are not.
The square root of 39 is not a rational number. It is somewhere between 6 and 7, but can only be written as radical(39). It is a non-ending decimal.No
Yes.
4u2 - 6u - 39 does not have rational factors.
0.39 is a rational number because it can be expressed as a fraction of two integers. Specifically, it can be written as 39/100, where both 39 and 100 are integers. Since rational numbers are defined as numbers that can be expressed in this way, 0.39 qualifies as rational.
Rounded to three decimal places, sqrt(39) = ±6.250
rational
that would would an irrational complex number. 6.245i
Yes, 7.8 is a rational number. Expressed as a top-heavy fraction, it is equal to 39/5 or thirty-nine fifths.