Contaminants in the air, ground, or water that come from a single identifiable cause what?

Had to look for the options and here is my answer.
Those contaminants that came from water, air, and ground, that has a single source would result in POINT-SOURCE POLLUTION. Point-source pollution has already been identified by The U.S. Environmental Protection Agency or the EPA. Hope this helps.

2. x2 + 8x + 12 = 0 to prove: x = -6 or x = -2