Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 10 - Section 10.3 - Preparing to Do Analytic Proofs - Exercises - Page 474: 29b

Answer

Negative number

Work Step by Step

In part a, we concluded that "a" is a positive number. Since a positive number times a negative number is a negative, it follows that $-a$ must be a negative number.
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