Answer
$(-\infty ,-3]$
Work Step by Step
$x+2\leq-1$
Solve for x by subtracting 2 from each side of the equation.
$x+2-2\leq-1-2$
$x\leq-3$
This is written in interval notation as $(-\infty , -3]$
The use of ] indicates that -3 is included in the set of possible values for x.