In Exercises, determine which, if any, of these functions might be used as a model for the data in the scatter plot.
a) Quadratic, f (x) = ax2 + bx + c
b) Polynomial, not quadratic
c) Exponential, f (x) = abx, or P0ekx, k > 0
d) Exponential, f (x) = ab-x, or P0e-kx, k > 0
e) Logarithmic, f (x) = a + b ln x
f) Logistic, f (x) = a / (1 + be-kx)

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