The function gives a toy car's height above the ground $f(x)$ in inch…

Question

Prompt

The function gives a toy car's height above the ground

f (x)

in inches,

x

seconds after it started moving on an elevated track, where

0 \leq x \leq 10

f (x) = \frac{1}{9} (x - 6)^{2} + 3

Which of the following is the best interpretation of the vertex of the graph of

y = f (x)

in the

x y

-plane?

The toy car's minimum height was 3 inches above the ground.

The toy car's minimum height was 6 inches above the ground.

The toy car's height was 3 inches above the ground when it started moving.

The toy car's height was 6 inches above the ground when it started moving.