Yes.
yes
Yes.
yes
It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.
Yes. Any rational number divided by another rational number is also rational.
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
rational
It isn't. All integers are rational numbers.
-39 has no rational roots.
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.
Yes, 7.8 is a rational number. Expressed as a top-heavy fraction, it is equal to 39/5 or thirty-nine fifths.
If there are no numbers after the 9 it is rational
No, they are not.
No, they are not.
It is a rational number. It can be written as a fraction.
yes
Is 12.05 a rational number or irrational number?