Sara has completed the 50m freestyle in 27.47 seconds and Hannah finish the course in 28.68 seconds.
now the question is asking us how to find a difference between those stats so what we do is find the difference between Hannah and Sarah
The answer to the question is x=5
Well the position function is:
h(t)=-16t^2+256
It will hit the ground when h(t)=0
-16t^2+256=0 factor out -16
-16(t^2-16)=0 factor difference of squares...
-16(t+4)(t-4)=0, since t>0
t=4 seconds