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