Chapter 4.4, Problem 11E

Special Rounding Instructions For this exercise set, round all regression parameters to three decimal places, but round all other answers to two decimal places unless otherwise indicated.

National Health Care Spending The following table shows national health care costs, measured in billions of dollars.

Date	1970	1980	1990	2000	2010
Costs, in billions	75	253	714	1353	2570

a. Plot the data.

b. Find an exponential function that approximates the data for health care costs.

c. By what percentage per year were national health care costs increasing during the period from $1970$ through $2010$?

d. Use functional notation to express how much money was spent on health care in the year $2011$, and then estimate that value.