Finance Use the accompanying graph to answer Exercise. Explain how you obtained your answe...

Finance Use the accompanying graph to answer Exercise. Explain how you obtained your answer from the graph, which shows the annual percent change in various consumer price indexes (CPIs). (See Examples 10 and 11.)

Source: U.S. Census Bureau.

(a) Was there any period between 1990 and 2006 when the CPI for all items was decreasing?

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(b) During what years was the CPI for energy decreasing?

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(c) During what years was the CPI for energy increasing?