Hello! i apologize that this question is so long. just me as much as you can.
during the period 1992-2000 the number c (in million)of people participating in cross country skiing and the number s (in million) of people participating in snowboarding can be modeled by
c = 0.067 t^3 - 0.107 t^2 + 0.27 t + 3.5
s = 0.416 t + 1.24
where t is the number of years since 1992.
write an equation that model the total number of people t (in millions ) participating in cross country skiing and snowboarding as a function of the number of years since 1992.