SAT Math Practice Question #6495 - SATify | SATify

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SAT Math Practice Question #6495 - SATify | SATify

#6495

functions

quadratic equations

graphs

word problem

modeling

applications

medium

75 sec

Calculator OK

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 $x y$ -plane?

A.

The metal ball's minimum height was 3 inches above the ground.

B.

The metal ball's minimum height was 7 inches above the ground.

C.

The metal ball's height was 3 inches above the ground when it started moving.

D.

The metal ball's height was 7 inches above the ground when it started moving.