a stone dropped from a balloon which was rising at the rate of 15 ft./sec. reached the ground in 8 seconds. how high was the balloon when the stone was dropped?

Answer 1

height of balloon = -16t^2 + 15t + h
0 = -16(8^2) + 15(8) + h
h = .....

Answer 2

it's 904 ft.

thank you :-)