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The set of rational numbers includes the set of natural numbers but they are not the same. All natural numbers are rational, not all rational numbers are natural.
it has the word rational in it
No, they are not.
Whole numbers and integers are the same. They are a proper subset of rational numbers.
Because both can be expressed as fractions
Whole numbers are the same as integers. Whole numbers are a proper subset of rational numbers.
Since the sum of two rational numbers is rational, the answer will be the same as for the sum of an irrational and a single rational number. It is always irrational.
There is no infinite rational number. There are infinitely many of them but that is not the same.
Natural numbers are a special kind of Rational numbers. Rational numbers can be expressed as a fraction. (Positive) fractions with the same (nonzero) numerator and denominator are natural numbers, for example 9/9 = 1.
It can't be both at the same time. Irrational means "not rational".
Counting numbers are a proper subset of whole numbers which are the same as integers which are a proper subset of rational numbers.
Any rational positive number is still rational when you make the same number negative.