average rate of change [1,3] = (15.882 - 11.38)/(3-1) = 4.502 /2 = 2.251
average rate of change [-4,-2] = (0.0971- 0.0018)/(-2+4) = 0.0953 /2 = 0.04765
average rate of change [1,3] / average rate of change [-4,-2]
= 2.251 / 0.04765
= 47.24
answer
47.24