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: 27

Answer

$[4,\infty)$ See the figure below.

Work Step by Step

Since the right boundary of the given inequality involves "greater than or equal", then the interval notion will have a bracket on left and paranthesis on right. Hence, the given inequality can be written as $[4,\infty)$. To graph, plot a solid dot at $x=4$, then shade the region from 4 till $\infty$. See the figure below.
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