Question

How long in seconds is the football in the air?

Answer 1

We need to find the time where the football reaches the ground, so:

`y=-16x^2+32x=0`
`\begin{gathered} solve_{\text{ }}for_{\text{ }}x: \\ -16x(x-2)=0 \\ so: \\ x=0 \\ or \\ x=2 \\ Therefore: \\ \Delta x=2-0=2 \end{gathered}`

Answer:

2 seconds