Answer
$\{x\ |\ x\leq 0\}$
Work Step by Step
$(-\infty,0]$ is the set of numbers less than 0, (left of 0), including 0 itself.
$(-\infty,0] =\{x\ |\ x\leq 0\}$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 1 - Mid-Chapter Check Point - Page 53: 16
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