Use the videos for help/practice
https://www.youtube.com/watch?v=Gi8_a7NlKAQ
https://www.youtube.com/watch?v=jJsE-IAMgUI
https://www.youtube.com/watch?v=L8o2vBRu8kQ
HW: Short quiz over 4.1 tomorrow and complete WS 4.2 Day 2 that was started in class.