I made a mistake with the demos, but no big deal. I meant to not have a demo 7, but demo 6 was worth 20 points. Therefore, just add demo 6&7 together to get the score and record in the textbook for Demo 6. Demo 7 จริง is after midterm. This week's demo score should be added to demo 6 to make a score out of 20. I can explain in class if it is unclear นะ