Answer
Yes.
Work Step by Step
We say that $A$ is a subset of $B$ if $B$ contains all elements in $A$.
$A\cap B=\{-5,10\}$
Here $C$ contains all elements in $A\cap B$, thus $A\cap B$ is a subset of $C$.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 10 Counting Methods and Probability - Extension - Apply Set Theory - Practice - Page 716: 11
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