Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Appendix A - Review - A.10 Internal Notation; Solving Inequalities - A.10 Assess Your Understanding - Page A87: 25


$[4,6)$ See the figure below.

Work Step by Step

Since the left boundary of the given inequality involves "less than or equal " and the right boundary involves "less than ", then the interval notation will have bracket on the left and a parenthesis on the right. Hence, the given inequality can be written as $[4,6)$. To graph, plot solid dot at $x= 4$ and a circle at $ x=6$, then shade the region between them. See the figure below.
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