## Algebra 2 (1st Edition)

$\{\},\{-2\},\{4\},\{9\},\{-2,4\},\{-2,9\},\{4,9\},\{-2,4,9\}$
We say that $A$ is a subset of $B$ if $B$ contains all elements in $A$. Hence here the subsets are: $\{\},\{-2\},\{4\},\{9\},\{-2,4\},\{-2,9\},\{4,9\},\{-2,4,9\}$