M Mason New member Feb 12, 2011 #1 http://www.khanacademy.org/video/adding-and-subtracting-rational-expressions-2?playlist=Algebra%20I%20Worked%20Examples What is that black background program where he can write / have pictures / etc? its not paint I'm sure of it . Anybody knows?
http://www.khanacademy.org/video/adding-and-subtracting-rational-expressions-2?playlist=Algebra%20I%20Worked%20Examples What is that black background program where he can write / have pictures / etc? its not paint I'm sure of it . Anybody knows?
