5. 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? Consumer Price Index 179 178 177 176 175 174 173 0 1 2 3 4 5 6 7 8 9 10 11 Months Since September, 2000 6. LABOR A town's jobless rate can be modeled by (1, 3.3), (2, 4.9), (3, 5.3), (4, 6.4), (5, 4.5), (6, 5.6), (7, 2.5), and (8, 2.7). How many turning points would the graph of a polynomial function through these points have? Describe them.