Question

If a is a rational number and b is a rational number, then the product ab must be

A) rational.
B) imaginary.
C) an integer.
D) irrational.

Answer 1

A. Rational

Explanation:

You cant make imaginary numbers by multiplication of rational numbers.

Since rational numbers includes fractions, a multiplication of rational numbers wont always mean a integer.

You cant make an irrational number by multiplication of rational.

Our answer must be rational.