Question

A football is kicked into the air from an initial height of 4 feet. The height, in feet, of the football above the ground is given by s (t)=-16^2+50t+4, where t is time, in seconds, and t>=0. At what time will the football be 25 feet above the ground?
3.625 seconds
3.20 seconds
0.5 seconds or 3.625 seconds
0.5 seconds or 2.625 seconds

Answer 1

what do you know

Answer 2

All I know that it's quadratic

Answer 3

okay 1 min

Answer 4

-16t^2+50t+4=25

Answer 5

Now what?