Here's a common question that I was asked once again today; Adrian, why do some of your materials point to equilibrium problems that contain the...
17 TOPICS, OR 6 OR 9 UNITS?
That sounds like a Chicago song, but ... ... in various places on this site, you will see references in the AP sections to "17 TOPICS", "6 UNITS"...
Updated CED (May 2019) – Emerging thoughts
So here we are with an updated CED. My experience of formally working with the College Board was painful, and was made more difficult at every turn...