The polynomial function y = -0.005x4 + 0.05x3 – 0.086x2 – 0.04x + 2.52 represents the fluctuating gas price (in dollars per gall
on) in a city over the course of 6 years. Calculate the average rate of change from year 0 to year 2, and then calculate the average rate of change from year 3 to year 6.