The annual expenditures for Medicare (in billions of dollars) by the US Government for selected years since 1980 are shown in Table 4. Let x represent the years since 1980. (Use 4 decimal places in all answers.) Table 4: Medicare Expenditures Year Billion $ 1980 37 1985 72 1990 111 1995 181 2000 197 2005 330 A. Find the exponential regression model for the data. M(x) =        B. What is the r2 value for this model? r2 =        C. Extimate (to the nearest billion) the expenditures in 2008? The Medicare expenditures in 2008 were about $         billion.

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