Based on the initial altitude and the rate that the plane is descending, the relevant equation is = 30,000 - 2,000x. The altitude after 5 minutes is 20,000 feet above sea level.
The plane begins at 30,000 feet above ground and is descending at 2,000 feet per minute. The relevant equation after x minutes is:
= Initial altitude - (Descent in feet per minute x Number of minutes)
Plugging in the values gives:
= 30,000 - (2,000 × x)
= 30,000 - 2,000x
If x is 5 minutes, the plane altitude would be:
= 30,000 - 2,000 x 5
= 20,000 feet above ground
In conclusion, the plane would be 20,000 feet above ground after 5 minutes.
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