Chapter 11 - Quadratic Functions and Equations - 11.8 Problem Solving and Quadratic Functions - 11.8 Exercise Set - Page 755: 26

$f\left( x \right)=a{{x}^{2}}+bx+c,a>0$

In the provided line graph, it is observed that the data points appear to represent the right half of a quadratic function that opens upward. Thus, the quadratic function $f\left( x \right)=a{{x}^{2}}+bx+c,a>0$ can be used to model the data.