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so I encountered this problem and tried doing t = -80/(2(-16)) but got a weird fraction can someone help me with this problem or finish it.

 

A ball travels on a parabolic path in which the height (in feet) is given by the expression -16t^2+80t+21 , where t is the time after launch. What is the maximum height of the ball, in feet?

 Jul 31, 2019
 #1
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t = -80/(2(-16)) 

Why are you having problems with this?

t = - 80 / (2 * - 16)

t = - 80 / - 32

t =2.5     Sub this value for t in -16t^2+80t+21 =-16*2.5^2 + 80*2.5 +21 =-100 + 200 + 21 =121 feet.

 Jul 31, 2019
edited by Guest  Jul 31, 2019
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Thanks guest

 Jul 31, 2019

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