Over twenty years, it was found that the number of doctors of medicine, MD (in thousands), in 28,390+693t
the United States can be approximated by MD =
where t = 0 represents 1980. The
85-t
776-12t
number of doctors of osteopathy, DO (in thousands), can be approximated by DO =
65-2t
a. Write an expression for the total number I of doctors of medicine (MD) and doctors of
osteopathy (DO). Simplify the result.
b. How many MDs did the United States have in 2010? How many DOs did the United States
have in 2010?