The graph of f\displaystyle {f} is given below:

Answer the following questions about the graph of f′\displaystyle {f}' based on the graph of f\displaystyle {f} above.

A) State the x−values over which f′\displaystyle {f}' is positive.  

B) State the x−values over which f′\displaystyle {f}' is negative.  

C) State the x−values over which f′\displaystyle {f}' is zero.  

D) State the x−values over which f′\displaystyle {f}' is undefined.  

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