Well yeah I have already sent in my final exam for algebra 2 online. But there is a question I put something besides A,B,C,D, or E. The equation is simple: Which of the following is S of 80 in the series 250 + 217 + 184 + 151 + ...? another way to word it is which is the eightieth number in the sequence? The answers they gave were... A. -84,280, B. -72,600, C. -54,300, or D. -42,100. My answer was not close. So any imput would be appriciated as to your answers. My answer is S of 80= -2390.