## Precalculus (6th Edition)

Published by Pearson

# Chapter R - Review of Basic Concepts - R.1 Sets - R.1 Exercises - Page 7: 28

#### Answer

$\in$

#### Work Step by Step

The symbol $\in$ means that the number is an element of the set. The symbol $\not \in$ means that the number is NOT an element of the set. Since $9$ is in the given set, then the missing symbol in the blank is $\in$

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