Logarithmic Function
(Graph)  Sketch a picture of the graph when b is positive. When b is negative.
(Direction)  When b > 0 describe the direction of the graph?  How about when b < 0?
(Concavity)  Describe the concavity of the function for b > 0 and b < 0.
(End Behavior)  When b > 0, what happens to f(x) as x goes to infinity?  What happens to f(x) when x goes to 0?  When b < 0 describe the end behavior of the function?
(Additional Features)  Are there restrictions on the value of x?  If so what are they?