The dollars per capita of federal tax burden T can be modeled by T = 2.11x 3

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The dollars per capita of federal tax burden T can be modeled by

T = 2.11x3 - 93.01x2 + 1373.9x + 394

where x is the number of years past 1990.

(a) Graph this function for values of x that correspond to the years from 1990 to 2018.

(b) Is the graph increasing or decreasing over these years? What does this tell us about the per capita federal tax burden?

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