Answer
none
Work Step by Step
The positive integers and the negative integers are mutually exclusive (there is nothing common to both of them.) Hence, there is no number, r, that is both positive and negative.
Intermediate Algebra (12th Edition)
by Lial, Margaret L.; Hornsby, John; McGinnis, Terry
Published by
Pearson
ISBN 10:
0321969359
ISBN 13:
978-0-32196-935-4
Chapter R - Section R.1 - Basic Concepts - R.1 Exercises - Page 10: 14
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