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: $|-a|=|a|$.
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.