SAT Math Practice Question
A helicopter, initially hovering 40 feet above the ground, begins to gain altitude at a rate of 21 feet per second. Which of the following functions represents the helicopter's altitude above the ground $y$, in feet, $t$ seconds after the helicopter begins to gain altitude?
- A.$y=40+21$
- B.$y=40+21 t$
- C.$y=40-21 t$
- D.$y=40 t+21$
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