Medicare. The annual expenditures for Medicare (in billions of dollars) by the U.S....

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 2017.

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