Determine Whether a Linear or Quadratic Function Would Be a More

Multiple Choice

Determine whether a linear or quadratic function would be a more appropriate model for the graphed data. If linear, tell whether the slope should be positive or negative. If quadratic, decide whether the coefficient of $x ^ { 2 }$ should be positive or negative. $\text {DENTAL FLOSS USE}$

$\text {Years since 2000}$

A) Linear; positive
B) Linear; negative
C) Quadratic; negative
D) Quadratic; positive