Question

solve the inequality and graph the solution.
-9 ≤ f - 13
plot the endpoints. select an endpoint to change it from closed to open. select the middle of the segment, ray, or line to delete it.

Explanation:

Step1: Add 13 to both sides

$-9 + 13\leq f-13 + 13$
$4\leq f$ or $f\geq4$

Step2: Graph on number - line

On the number - line, place a closed circle at 4 (since the inequality is $\geq$) and draw a ray to the right.

Answer:

The solution of the inequality is $f\geq4$. On the number - line, there is a closed circle at 4 and a ray extending to the right.