Use a graphing calculator to plot the data and find the quadratic function of best fit.A small manufacturing firm collected the following data on advertising expenditures (in thousands of dollars) and total revenue (in thousands of dollars). 
Find the quadratic function of best fit.
A. R(x) = -0.31x2 + 2.63x + 6128
B. R(x) = -0.024x2 + 7.13x + 6209
C. R(x) = -0.015x2 + 4.53x + 6123
D. R(x) = -0.091x2 + 5.95x + 6337
Answer: D
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