Based on the graph I think Mr. Cresswell missed the rim but might have made it on the bank in.

I learned that if you put a negative in front of the x squared then the whole graph flips upside down. I also learned that you can put a negative in front of the square root and that too flips upside down which i didn't think it would work i thought it would just come up as an error. Those are the two things that I learned most about everything else was pretty basic