These Q & A threads in this discussion forum represent asynchronous "in class" time together. Discuss a concept, or problem in chapter 18 that you struggled with or could relate to on some level. If your question relates to an Assignment question, state the complete question number in the text (e.g., Problem 18-5A) and thread. Show what you did on that question (the wrong answer). You may also post an "Aha", moment when a concept in Chapter 18 clicked in your mind and made sense. Simply stating that you watched a video online will not suffice