Answer
See below.
Work Step by Step
Use Theorem 4.2.1, results from previous exercises, and Theorem 4.2.2,
we have:
1. $2,3,r, s$ are rational numbers,
2. $2r, 3s$ are rational numbers,
3. Thus $2r+3s$ is a rational number.
Discrete Mathematics with Applications 4th Edition
by Epp, Susanna S.
Published by
Cengage Learning
ISBN 10:
0-49539-132-8
ISBN 13:
978-0-49539-132-6
Chapter 4 - Elementary Number Theory and Methods of Proof - Exercise Set 4.2 - Page 169: 24
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