MATH PREALGEBRA
posted by MATH DUDE .
Explain how to know wheather the endpoint of the graph of an inequality should be a closed dot or an open dot.

It should be an open dot because it's an inequality. It would be a closed dot if it was an equality, such as x=3.

If the inequality contains either ≤ or ≥, then close the dot of the endpoint, since that point is included in the graph.
If the inequality contains eitehr < or > , then leave the dot open to show that the endpoint itself is not included in your graph. 
yes! if it is addition or subtraction you have an open dot! if it multiplication or division than a closed dot!