how long does it take the helicopter to reach the ground? minutes

how long does it take the helicopter to reach the ground? minutes
Answer
Explanation:
Step1: Identify ground - level height
The ground - level height is 0 ft. On the graph, we need to find the x - value (time) when the y - value (height of the helicopter) is 0.
Step2: Read the time from the graph
Looking at the graph, when the height of the helicopter (y) is 0, the time (x) is 4 minutes.
Answer:
4