Net Area with Graph Question

[joe19]

Should be a fairly quick question, but I was given the graph of [MATH]g(x)[/MATH]:

which was followed by the question:

So I'm a bit lost on how I'd go about determining concavity, I know it's determined from the second derivative, but I'm confused on how I'd even go about getting that here in the first place. Any help would be appreciated.

 

[Dr.Peterson]

Do you see that the graph is the graph of the first derivative of h?

Then what should you look for on the graph to find where the second derivative is negative?