Question 1088905
If h(t)=-5t²+at+b, then the maximum height is achieved at -a/2(-5) for t. So:
3=-a/-10
-a=-30
a=30
So, to find the height of the building, b, we have
125=-5(3²)+30(3)+b
125=90-45+b
b=80 ft. as the height of the building
☺☺☺☺