I think that Val is right-- it's probably the CC 8th grade course. Is the textbook Pearson's "Course 3" by any chance? That textbook is a horror show of modern textbook writing er-- well, compilation, let's just say.



DD helped tutor a LOT of students through that mess of a textbook, and the course that it went with-- which was just as labyrinthine. There were literally concepts that required skills in chapters that FOLLOWED the material being covered. It wasn't isolated, either-- it was a regular feature.

Schrödinger's cat walks into a bar. And doesn't.