Answer
a. a real number; greater than $r$
b. real number $r$; there exists a real number $s$
Work Step by Step
Note that infinity does not satisfy the property required of $s$ because infinity is not a real 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 1 - Speaking Mathematically - Exercise Set 1.1 - Page 6: 4
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