32. The consumption of food in the U.S has varied in the past decades, as shown by the data below. Let x =# of years since 1940. Year Consumption by Billions a. Determine the R value for each of following models 1950 12.4 1960 21.8 Linear: 1970 20.4 Quadratic: 1980 19.3 1990 24.0 Cubic: b. What is the best model to use? c. How much food was consumed in the U.S. in 1975