Answer:
Therefore,
Fireworks for 5 seconds in the air before returning to the ground.
Explanation:
Given:
The function modeling the path of the fireworks is given as

Where,
h represents the height of the fireworks t seconds after launch.
To Find:
How long where the fireworks in the air before returning to the ground,
t = ? at h = 0
Solution:
The function modeling the path of the fireworks is given as

Put h(t) =0 for time t = ?

As t cannot be 0

Therefore,
Fireworks for 5 seconds in the air before returning to the ground.