Tell Whether a Linear Model or a Quadratic Model Is

Multiple Choice

Tell whether a linear model or a quadratic model is appropriate for the data. If linear, tell whether the slope
positive or negative. If quadratic, decide whether the leading coefficient a of x² should be positive or negative.
-The amount of sales tax paid as a function of the sales price.

A) quadratic; negative
B) quadratic; positive
C) linear; negative
D) linear; positive