10. Over twenty years, it was found that the number of doctors of medicine, MD (in thousands), in the United States can be approximated by where represents 1980. The number of doctors of osteopathy, DO (in thousands), can be approximated by .
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

arithmetic sequence

step-by-step explanation:

given that a sequence has terms as

19, 15, 11,

this is represented on a graph

the pattern indicates that the sequence is an arithmetic sequence with i term

a=19 and common difference d =-4

any general term

thus the sequence is reduced by 4 for each successive term starting from 1 and nth term is

24-5n.

first negative term would start after 5th term

5th term =24-25< 0

from 5th term onwards the sequence would be negative.