Right. Good jobOk, so I got a, at least I think I did.. I used the quadratic equation and ended up with 2.3 seconds as my answer..

You want h>5b) The ball must clear the uprights for the field goal to count. The uprights are approximately 5m high. How long does the ball stay above 5m in height?

so

-4.9tē + 10t + 3 > 5

-4.9tē + 10t - 2 > 0

Now you need to find the solutions of -4.9tē + 10t - 2 = 0, then find the length of time between them.