The worksheet over derivitives and their graphs was easy enough, but we really didn't need the extra day on monday to work on it, I just worked on other homework. As for 4.3, I wasn't completely sure whagt a point of inflection was, and I'm still not certain (but I doubt myself with everything). It's just where the concavity changes right? The part about solving algebraicly where the graph was increasing/decreasing and concave up/down I would have never got if you hadn't explained it, really glad I didn't sleep though that part (I'm getting better about it!). Three day weekends are good, but are kind of moot when there's exams looming over the week afterwards.