a) Find the first and second derivatives.

b) Identify the graph that displays in blue and in red.

A.     B.

C.     D.

c) Using the graphs of and , indicate where is concave up and concave down. Give your answer in the form of an interval.

NOTE: When using interval notation in WeBWorK, remember that:
        You use 'INF' for and '-INF' for .
        And use 'U' for the union symbol.
Enter DNE if an answer does not exist.

is concave up on

is concave down on

You can earn partial credit on this problem.