The number of new accounts opened at a credit union in the years 2001 to 2006 can be approximated by the model N(t)= -80.6t^2+2100t+12000, where 11 <= t <= 16, with t = 11 corresponding to 2001. Using this model and your graphing calculator, determine the year in which the number of new accounts opened was maximum
the max is on the axis of symmetry of the parabola
t = -b / 2a = -2100 / (2 * -80.6)