In 2004, there were 20 million people worldwide who had been infected with a particular disease. At that time, the infection rate was 3.9 million people per year.
(a) Write a formula for a linear function that models the total number of people in millions who were infected with the particular disease x years after 2004.
(b) Estimate the number of people who may have been infected by the year 2019.
(a) f(x) = 20 + 3.9x
In 2004, there were 20 million people worldwide who had been infected with a particular disease. At that time, the infection rate was 3.9 million people per year. Write a formula for a linear function that models the total number of people in millions who were infected with the particular disease x years after 2004. Estimate the number of people who may have been infected by the year 2019.
(a) f(x) = 20 + 3.9x
(Use integers or decimals for any numbers in the expression.)