Ay + National health expenditures (in billions 4000- of dollars) from 1980 to 1995 are given by the 3500 function f(t) in the graph to the left. 3000 (a) How much money was being spent at the 2500 beginning of 1984? 2000 $ billion 1500 1000 500 8 10 12 14 16 Years after 1980 The blue curve shows national health expenditures in billions of dollars. The red curve shows its derivative