For the scatterplots and graphs in Exercises 71-76, determine which, if any, of the following functions might be used as a model for the data.
a) Linear, f(x) = mx + b
b) Quadratic, f(x) = ax2 + bx + c, a > 0
c) Quadratic, f(x) = ax2 + bx + c, a 6 0
d) Polynomial, not linear or quadratic
1.

2.

3.

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