Question

A punter kicks a football into the air. The pathway of the football can be represented by the equation h=-16t^2+82t (where t= time in seconds and h= height in feet.) How long will it take the football to reach the ground.

Answer 1

5.125 seconds ok?
You would use the equation
16x^2 + 82x = 0 saying that the ground is 0 height.
So as you know by PEMDAS exponents are first so you would do 5.125^2 which is 26.265625,
So you would do -16 x 26.265625 which is -420.25
So now you know the left side of the equation, and the right side is easy since it is just 82 x 5.125, which is 420.25
And -420.25 + 420.25 = 0!