Answer
See below.
Work Step by Step
A parathensis sign implies that $a$ (being a real number) is not part of a specific interval.
A bracket sign implies that $a$ (being a real number) is part of a specific interval.
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 4 - Section 4.1 - Solving Linear Inequalities - Exercise Set - Page 264: 67
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