the function f(t)=1.875t + 15 models the population, in thousands, of waterville,t years after 1990. the function g(t)=15/128 t²-15/16 t+ 30 models the population, in thousands, of golden valley, t years after 1990. the graphs of the function are shown. for what years from 1990 to 2010 was the population of golden valley greater than or equal to that of waterville