Answer
$n\geq-2$
Work Step by Step
$2n+1\geq-3\longrightarrow$ subtract 1 from each side
$2n+1-1\geq-3-1\longrightarrow$ subtract
$2n\geq-4\longrightarrow$ divide each side by 2
$2n\div2\geq-4\div2\longrightarrow$ divide
$n\geq-2$
Since -2 is included in the solution set, the endpoint of the graph is a solid circle.
