Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 1 - Section 1.1 - Algebraic Expressions, Real Numbers, and Interval Notation - Exercise Set - Page 13: 38



Work Step by Step

A rational number is a number that can be expressed as a quotient of two integers. Note that $9 = \frac{18}{2}$. 18 and 2 are integers. Thus, $9$ is a rational number. $\in$ means that the number is an element of the given set. Since $9$ is a rational number, it is an element of the set of rational numbers. Therefore, the given statement is true.
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