For the period 1985 - 2001, the number *y *(in millions) of cell phone service subscribers in the U.S. can be modeled by the function y = 0.7x^2 - 4.3x + 5.5 where x is the number of years since 1985. In what year were there 16,000,000 cell phone service subscribers?

GAMEMASTERX40 Apr 12, 2018