Math Lesson 21, Session 2 Algebra with one-variable addition
Today we'll take the quiz on Lesson 19. If you are working from home, make sure to review the Lesson 19 videos from last week so that you'll be ready for the quiz as soon as you return.
After the quiz, we'll get started on Lesson 21. This is a continuation of our lessons about algebra. And by the way, we didn't forget Lesson 20! It's just really short, and we can cover all the important ideas in Lesson 21.