(C) In the graph below, the first rectangle shows 2 tickets sold per minute
for 15 min, or 30 tickets. Similarly, the total is 2(15) + 6(15) + 10(15) +
4(15).(B) Graph both functions in [–8,8] × [–5,5]. The curves intersect at P, Q,
R, and S (at T the curves are close but do not intersect). At point of
intersection Q, both are decreasing. Use a graphing calculator to find that
the intersection point at Q reveals an x-coordinate of –3.961.