Algebra 1

$c\gt3$
$4+c\gt7\longrightarrow$ subtract 4 from each side $4+c-4\gt7-4\longrightarrow$ subtract $c\gt3$ Check the inequality. $4+4\overset?\gt7$ $8\gt7\checkmark$ The endpoint of the graph is an open circle at 3 since the inequality does not include 3.