After Some Experimentation, You Have Observed the Following Data Concerning

Multiple Choice

After some experimentation, you have observed the following data concerning the relationship between marketing and sales. Use Excel's curve fitting method to find the best quadratic equation to model this relationship.
$\begin{array}{|l|c|c|c|c|c}\hline \begin{array}{l}\text { Marketing } \\(\$) \end{array} & 100 & 110 & 120 & 130 & 140 \\\hline \begin{array}{l}\text { Sales } \\(\$ 100) \end{array} & 310 & 400 & 500 & 600 & 700 \\\hline\end{array}\begin{array}{|r|r|r|r|r|r|}\hline \\150 & 160 & 170 & 180 & 190 & 200 \\\hline \\850 & 975 & 1,100 & 1,300 & 1,425 & 1,600 \\\hline\end{array}$

A) 0.11x2 + 1.4x + 40
B) 0.05x2 ? 1.1x ? 44
C) 0.05x2 + 1.1x + 44
D) 0.11x2 ? 1.4x ? 40
E) 0.05x2 ? 1.1x + 44