3. (Section 1.2, # 25, p.17) The surface of the sun has tark areas known as sunspots, that are cooler than the rest of the sun's surface. The number of sunspots fluctuates with time, as shown in the figure below. Compute the average rate of change between 1980 and 2000 (use appropriate units). ARC[1980, 20001- Examine the graph to decide whether this 160 function is increasing, decreasing or neither in the following intervals: 120 s0 [1980, 2000] 1976, 1979 1980, 1986 r 40 (year 1960 197O 1980 1990 2000 2010