The function $f(x)=\frac{1}{9}(x-4)^{2}+5$ gives a toy car's height a…

Question

Prompt

The function

f (x) = \frac{1}{9} (x - 4)^{2} + 5

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

. 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 5 inches above the ground.

The toy car's minimum height was 4 inches above the ground.

The toy car's height was 5 inches above the ground when it started moving.

The toy car's height was 4 inches above the ground when it started moving.