I introduce the Definite Integral, explain the definition, and work through an example of using the Definite Integral notation and Riemann Sum to find the area bound by a function and the x axis on a closed interval. Find free review test, useful notes and more at http://www.mathplane.com/ If you'd like to make a donation to support my efforts look for the "Tip the Teacher" button on my channel's homepage / profrobbob