Yes. Rational numbers are numbers that can be written as a fraction. Irrational Numbers cannot be expressed as a fraction.
If both numbers are rational then x plus y is a rational number
Yes, it is.
Yes, the sum is always rational.
They add up to 17.02 which is rational number
The way in which the binary functions, addition and multiplication, are defined on the set of rational numbers ensures that the set is closed under these two operations.
The sum is a rational number.
It can be written as a fraction, so it is rational.
Yes. In fact, a rational plus or minus an irrational will always be irrational.
Yes, because 7+5 = 12 which is a rational number