It stands for video electronics standards association
I'll try to understand this but I don't really get it because I'm in middle school
Answer: See the diagram below.
This diagram shows a closed filled in circle at -14 on the number line. Also, the shaded region is to the left of the closed circle. This visually represents values that are smaller than -14, or equal to -14.
The filled in circle is used to indicate "include this endpoint". In contrast, an open hole indicates "do not include this endpoint" which is only used if the inequality was
instead of
. The "or equal to" portion is why we include the endpoint.