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PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! The expression -5t2+40t predicts the height, in meters, of an object t seconds after a person launches it into the air. Using
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PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

The expression -5t2+40t predicts the height, in meters, of an object t seconds after a person launches it into the air. Using this expression, how many seconds will it take the object to hit the ground?

User Konstantin Konopko
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-5t2 + 40t = 0
5t(-t+ 8) = 0
5t = 0 or t = 8
User Matthias Urlichs
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