graphing quadratics: https://www.youtube.com/watch?v=FIed0m26vFY&feature=youtu.be
solving quadratics: https://www.youtube.com/watch?v=QSDErq4Dcy0&feature=youtu.be
average rate of change: https://www.youtube.com/watch?v=CKy4iidYUAA&feature=youtu.be
transformations of quadratics: https://www.youtube.com/watch?v=-CSS0Y1KRzo&feature=youtu.be
piecewise functions: https://www.youtube.com/watch?v=uaD8DxJQZWE
use the calculator for piecewise functions: http://youtu.be/4ZQQWn7l5ss