The table below gives U.S. coal consumption for selected years.

(a) Draw a scatterplot, letting t = 0 represent 1950.
(b) Use the quadratic regression feature of a graphing calculator to get a quadratic function that approximates the data.
(c) Graph the function from part (b) on the same window as the scatterplot.
(d) Use cubic regression to get a cubic function that approximates the data.
(e) Graph the cubic from part (d) on the same window as the scatterplot.

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Year 1950 1960 1970 1980 1990 2000 2010 2018 Millions of Short Tons 494.1 398.1 523.2 702.7 904.5 1084.1 1048.5 687.3