The table below gives U.S. lead emissions, L. into the environment in millions of metric tons for 1970-1992. Let t = 0 in 1970. 1970 1975 1980 1985 1988 1989 1990 1991 1992 8 5.6 5.2 4 Year Lead emissions 224.3119.8 44.4 17.6 8.4 (a) Find an exponential model for these data. Lead emission, L(1) = (b) Find a fourth-degree polynomial model for these data. Lead emission, L(1) - (c) Which of these curves gives a better model for the data? OA. exponential model

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