By algebraic handling, we find that the plane reaches an altitude of 21,000 feet at a time of 6 minutes after lift-off.
What is the altitude of a plane after lift-off?
In this question we observe that the altitude of a plane is modelled by a linear equation in terms of time, where the altitude of the plane is increased at constant rate in time. We must find to which time the plane reaches an altitude of 21,000 feet after lift-off:
21,000 = 3,400 · t + 600
20,400 = 3,400 · t
t = 6
By algebraic handling, we find that the plane reaches an altitude of 21,000 feet at a time of 6 minutes after lift-off.
To learn more on linear equations: https://brainly.com/question/11897796
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