Answer
$x\le0$
Work Step by Step
$\bf{\text{Solution Outline:}}$
Use the concept of inequality to translate the given description,
\begin{array}{l}\require{cancel}
\text{a number $x$ is nonpositive}
,\end{array}
to symbols.
$\bf{\text{Solution Details:}}$
Nonpositive numbers include $0$ and the negative numbers. Hence, in symbols, the given description is equivalent to
\begin{array}{l}\require{cancel}
x\le0
.\end{array}
