Question s-40-3
The equation gives the speed , in miles per hour, of a certain car seconds after it began to accelerate. What is the speed, in miles per hour, of the car seconds after it began to accelerate?
s = 40 + 3 t The equation gives the speed s , in miles per
Medium-difficulty · SAT Math · Linear Functions — Rate of change applications. Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.
Answer explanation
Choice D is correct. In the given equation, is the speed, in miles per hour, of a certain car seconds after it began to accelerate. Therefore, the speed of the car, in miles per hour, seconds after it began to accelerate can be found by substituting for in the given equation, which yields , or . Thus, the speed of the car seconds after it began to accelerate is miles per hour.
Choice A is incorrect and may result from conceptual or calculation errors.
Choice B is incorrect and may result from conceptual or calculation errors.
Choice C is incorrect and may result from conceptual or calculation errors.
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