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25 days ago

14

Holly plays tennis on the school tennis team. She can hit a tennis ball really high in the air. She learned that the quadratic e

quation (not the quadratic formula), y=5x^2+40x could be used to determine the height of a tennis ball after it was it with a tennis racket (y=height of the tennis ball in feet, x = seconds after the ball is hit with the racket).
A) How long does it take for the ball to hit the ground?
B) What is the highest point reached during the flight of the ball? how do you know?
C) When was the ball exactly 75 feet off the ground?

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we know that

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