When a function is concave up it means the average rate of change increases as the it moves from side to side. Then when it is concave down the average rate of change decreases as it moves side to side. This means that is I move the the point of intersection from left to right it would either increase or decrease but I think the secant line concavity still remains the same. https://ggbm.at/jWF9c96r this link is from the app I was using to help me with this assignment. It showed me how the solutions work for the concavity of the graph and it relevancy. The graph below is an example of the demo I used to hep me understand how the concave graphs really work. One thing I would say I don’t understand is why the graphs show up the way they do. Usually you would think up or down to be as its said but to me I get confused on which one is concave up or down. Do any of you guys have any ideas on what I can do to help me understand how to determine easily which one is up or down?