0. The graph shows the rate at which people enter an art museum, a(t), measured in people per hour, where t is measured in hours after the museum opens. a. Identify the interval(s) on which a is increasing. What does this mean in the context of this problem? 200 -180- 160- -140 -120- b. Identify the interval(s) on which a is constant. What does this mean in the context of this problem? -100- -80- -60- c. Identify the maximum of a and interpret its meaning in the context of this problem. d. When is a(t) = 0? What does this mean in the context of this problem? -40 20- 5 6 t (hours) 8 9