Use the following information regarding the farm population(in millions of persons)from 1945 to 1990.

Year 1945 1990
Millions of Persons 24.3 4.4

a. Write a linear model for the farm
population, y, in millions of
persons. Let X=0 represent 1945.
b. Use the linear model to estimate the
average farming population in 1975.
c. Use the linear model to estimate the
average farming population in 1980.