C = 20t^2 + 135+ + 3050, where C is the number of new cars and t = 0 corresponds to the number of new cars purchased in 1998. In what year will the number of new cars purchased reach 15,000?
+37146 15000 = 20 t^2 + 135t + 3050 is '3050' correct? And I assume that is 135 t not 135 +
