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Yes. Rational functions must contain rational expressions in order to be rational.
Yes. An equation has an "=" sign.
Rational numbers are closed under multiplication, because if you multiply any rational number you will get a pattern. Rational numbers also have a pattern or terminatge, which is good to keep in mind.
After multiplying or dividing two rational expressions it is sometimes possible to simplify the resulting expression.
A Rational number is a fraction of two integers; a rational expression is a fraction that contains at least one variable