When I got up in the morning I put on only a light jacket because, although the temperature was dropping, it seemed that the temperature would not go much lower. But I was wrong. Around noon a northerly wind blew up and the temperature began to drop faster and faster. The worst was around 8 pm when, fortunately, the temperature started going back up. Let t=0 hours at 8 am. When was there a critical point in the graph of temperature as a function of time?When was there an inflection point in the graph of temperature as a function of time?