Answer
$z\lt5.4$
Work Step by Step
$8.6+z\lt14\longrightarrow$ subtract 8.6 from each side
$8.6+z-8.6\lt14-8.6\longrightarrow$ subtract
$z\lt5.4$
Check the inequality.
$8.6+4\overset?\lt14$
$12.6\lt14\checkmark$
Since 5.4 is not included in the solution, the endpoint of the graph is an open circle.
