Determine which, if any, of the following functions might be used as a model for the data: Linear, with 
quadratic, with 
quadratic, with with 
neither linear nor quadratic.
A. f(x) = mx + b
B. f(x) = ax2 + bx + c, a < 0
C. f(x) = ax2 + bx + c, a > 0
D. neither linear nor quadratic
Answer: B
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