In problem involving days, a 365-day year is assumed. Medicare. The annual expenditure...

In problem involving days, a 365-day year is assumed.

Medicare. 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 for the data. Estimate (to the nearest billion) the annual expenditures in 2015.

(B) When will the annual expenditures teach one trillion dollars?