Over twenty years, it was found that the number of doctors of medicine, MD (in thousands), in the United States can be approximated by MD =
28.390+693
where t = 0 represents 1980. The
85-
776-120
number of doctors of osteopathy, DO (in thousands), can be approximated by DO =
65-21
a. Write an expression for the total number I of doctors of medicine (MD) and doctors of
osteopathy (DO). Simplify the result.