The first link below leads to a Math video that I think will help students who are still having trouble with the fresh concepts from Chapter 12. The second link below takes you to a page with written notes and illustrated examples for the key concepts thus far in Chapter 12.
Please view and study this information on your own time so that you are prepared for class and any other upcoming assessments.
Link 2– Second link Notes
This third link leads to the embedded video below…
Hope this helps! Any other questions just let me know, thanks!