At the point where , is increasing or decreasing, and is it concave up or down?
Decreasing, concave up
There is no concavity at that point.
Increasing, concave up
Decreasing, concave down
Increasing, concave down
At what point does shift from decreasing to increasing?
, is 
increasing or decreasing, and is it concave up or down?
shift from decreasing to increasing?