Explanation and Examples
Source: ProfRobBob at YouTube: http://www.youtube.com/watch?v=QNrS74TchSM
Source: Krista Hands at YouTube: http://www.youtube.com/watch?v=b7zOopuB0lE
Source: Adrian Wilson at YouTube: http://www.youtube.com/watch?v=oJ60Q_S-cvU
Source: JHMattDept at YouTube: http://www.youtube.com/watch?v=M6mZEw1mEZE
Source: Mathispower4u at YouTube: http://www.youtube.com/watch?v=b53nhCEXlGI
Source: Mathispower4u at YouTube: http://www.youtube.com/watch?v=MJGSh9Px2uw
Source: Mathispower4u at YouTube: http://www.youtube.com/watch?v=wEUuaB1esN4