SOLUTION: If Height= -16t^2+75t+4.how long would it take before the ball hits the ground? Round to the nearest hundredth.

Question 729928: If Height= -16t^2+75t+4.how long would it take before the ball hits the ground? Round to the nearest hundredth.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
If Height= -16t^2+75t+4.how long would it take before the ball hits the ground? Round to the nearest hundredth.
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Height is zero when the ball hits the ground.
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Solve -16t^2 + 75t + 4 = 0
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t = 4.74 seconds
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t = [-75 +- sqrt(75^2-4*-16*4)]/(-32)
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t = [ -75 +- sqrt(5881)]/(-32)
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t = [-75+- 76.688]/(-32)
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Positive solution:
t = [-75-76.6881]/(-32)
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t = 4.74
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Cheers,
Stan H.
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