Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter R - Review of Basic Concepts - R.1 Sets - R.1 Exercises: 53

Answer

true

Work Step by Step

$A \subseteq B$ if all elements of set A are also elements of set B. Note that all elements of D are also elements of B. This means that $D \subseteq B$. Therefore, the given statement is true.
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