Answer
$(-\infty, 12)$
union
Work Step by Step
The set of elements in $(-\infty, 9)$ or $(-\infty, 12)$ or in both sets is $(-\infty, 12)$. This represents the $\textit{union}$ of these intervals.
$$(-\infty,9)\cup(-\infty,12)=(-\infty,12).$$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 1 - Equations and Inequalities - Concept and Vocabulary Check - Page 195: 5
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