80 370 860 ? 2440 3530  Pick one:	A) 900	B) 840	C) 750	D) 860	E) 1550
10^2 - 20 = 80   20^2 - 30 = 370   30^2 - 40 = 860   40^2 - 50 = 1550   50^2 - 60 = 2440   60^2 - 70 = 3530.   ANSW1550R:1550
<result>E</result>
80 370 860 ? 2440 3530