The annual expenditures for Medicare (in billions of dollars) by the U.S. government for selected years since 1980 are shown in Table 5. Let x represent years since 1980.
(A) Find an exponential regression model (y = ab^x) for the data. Estimate (to the nearest billion) the annual expenditures in 2025.
(B) When will the annual expenditures exceed two trillion dollars?

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Table 5 Medicare Expenditures Year Billion $ 1980 37 1985 72 1990 111 1995 181 2000 197 2005 299 2010 452 2015 546