Answer
no
Work Step by Step
B′ is a subset of A if all the members of B′ are also members of A. B′ includes 15, which is not a member of A, so B′ is not a subset of A.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 3 - Solving Inequalities - 3-6 Compound Inequalities - Practice and Problem-Solving Exercises - Page 206: 58
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