Rate of Change Guided Practice The table below gives the population of California since 1970: Year Population 1970 1980 1990 2000 2010 (in millions) 20.0 23.7 29.8 33.9 37.3 A. Find the average rate of change for each decade. During which decade was the average rate of change the largest? SLOPE: rise = run change in y change in x Given 2 points: (x1,y1) (X2. Y2) Formula: Y2-V1 X2-X1 B. Use the average rate of change during the decade 1990 to 2000 to approximate the California population in 1993. C. Use the average rate of change during the decade 2000 to 2010 to approximate the California population in 2009.