Answer
false
Work Step by Step
The symbol $\not \in$ means "is not an element of" or "is not in".
Since $7$ is an element of the given set, then the given statement is false.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter R - Review of Basic Concepts - Chapter R Test Prep - Review Exercises - Page 81: 6
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