Complete each of the following.
a. Graph each function by making a table of values.
b. Determine the consecutive values of x between which each real zero is located.
c. Estimate the x-coordinates at which the relative maxima and minima occur.

PRICES The Consumer Price Index (CPI) gives the relative price for a fixed set of goods and services. The CPI from September 2000 to July 2001 is shown in the graph.

Source: U. S. Bureau of Labor Statistics

a. Describe the turning points of the graph.
b. If the graph were modeled by a polynomial equation, what is the least degree the equation could have?