Use the accompanying graph to answer Exercise 54. The graph shows the annual percent chang...

Use the accompanying graph to answer Exercise 54. The graph shows the annual percent change in various consumer price indexes (CPIs). (See Examples 1 and 2.)

(a) During what years did the CPI for apparel show an increase?

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(b) When was the CPI for apparel increasing at the greatest rate?

Example 1

Figure 3.12, on the following page, shows the median sales prices (in thousands of dollars) of new privately owned one−family houses by region of the United States (northeast, midwest, south, and west) from the years 2005 to 2011.

Example 2

Figure 3.13 is the graph of the function f whose rule is f(x) = average interest rate on a 30−year fixed−rate mortgage for a new home in year x.