A government agency estimates the number of young adults (ages 18 to 24) in a particular country to be 31,000 (in thousands) in 2010 and changing at the rate of -x + 80x - 400 thousand per year, where x is the number of years since 2010. Find a formula for the size of this population at any time x. [Hint: Keep all calculations in units of thousands. ] P ( x ) = X Use your formula to predict the size (in thousands) of the young-adult population in 2040. X thousand Need Help? Read It