Answer
Nonnegative numbers: $a\geq0$.
Nonpositive numbers: $a\leq0$.
Nonnegative numbers: $a\geq0$.
Work Step by Step
Examples:
$|5|=5$, $|-5|=5$, $|-0|=|0|=0$.
Notice that: $|-a|=|a|$.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 1 - Precalculus Review - 1.1 Real Numbers, Functions, and Graphs - Preliminary Questions - Page 9: 2
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