Answer: To find the plane's altitude at 5 minutes, we can substitute x = 5 into the equation:
y = -2000x + 30,000
y = -2000 * 5 + 30,000
y = -10,000 + 30,000
y = 20,000
So the plane's altitude at 5 minutes is 20,000 feet.
Explanation:
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