(Quadratics) The height "h" meters of a ball at time "t" seconds after it is thrown up in the air is given by the expression:
h = 1 + 15t - 5t^2
if it reaches 11 meters in 1second and 2 seconds,
a) use your calculator to find at what time it reaches the ground.
b)What is the greatest height the ball reaches?
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