1.  For identify the point of diminishing returns for the input-output function, when R is the revenue and x is the amount spent on advertising.

2.  For the function with the interval use a graphing utility to graph and on the same viewing rectangle. Graphically locate the relative extrema and points of inflection of the graph.

3.  For the function with the interval use a graphing utility to graph and on the same viewing rectangle. Graphically locate the relative extrema and points of inflection of the graph.