An airplane descends from an altitude of 9,500 feet to 5,000 feet at a constant rate of 400 feet per minute. What type of function best models the relationship between the descending airplane’s altitude and time?
Correct answer: B (parsed from the explanation — this source omits an answer key for this item)
Explanation
Choice B is correct. It′s given that the airplane descends at a constant rate of 400feetperminute . Since the altitude decreases by a constant amount during each fixed time period, the relationship between the airplane′s altitude and time is 9,500feet 5,000feet linear. Since the airplane descends from an altitude of to , the airplane′s altitude is decreasing with time. Thus, the relationship is best modeled by a decreasing linear function. Choice A is incorrect and may result from conceptual or calculation errors. Choice C is incorrect and may result from conceptual or calculation errors. Choice D is incorrect and may result from conceptual or calculation errors.
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