Question 9f6a7657

The function $f (x) = \frac{1}{9} {(x - 7)}^{2} + 3$ gives a metal ball's height above the ground $f (x)$ , in inches, $x$ seconds after it started moving on a track, where $0 \leq x \leq 10$ . Which of the following is the best interpretation of the vertex of the graph of $y = f (x)$ in the xy-plane?

Advanced Math - Nonlinear functions