The equation ℎ = −2t^2 + 16t + 9 represents the height of a ball where h, is the height of the ball above ground, in metres and t, is the time, in seconds.   a) Determine the maximum height (complete the square) of the ball and when it occurs.  b) What is the height of the ball after 2 seconds?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
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Chapter3: Multi-step Equations And Inequalities
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The equation ℎ = −2t^2 + 16t + 9 represents the height of a ball where h, is the height of the ball above ground, in metres and t, is the time, in seconds.
 
a) Determine the maximum height (complete the square) of the ball and when it occurs. 
b) What is the height of the ball after 2 seconds? 
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