Answer:
t = [0.493,4.2]
Step-by-step explanation:
The height of the rocket straight up into the air is given by :

We need to find the interval the rocket be at least 43 feet above the ground.

So, the required interval during which the rocket is at least 43 feet above the ground is [0.493,4.2].
I think the answer is 78 because more usually mean addition so 57+21=78
Answer:
then get un stuck
Step-by-step explanation:
The answer to that question will be 3