The equation x + y = 1,440 represents the number of minutes of daylight (between sunrise and sunset), x, and the number of minutes of non-daylight, y, on a particular day in Oak Park, Illinois. If this day has 670 minutes of daylight, how many minutes of non-daylight does it have?

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Accepted Answer

Choice B is correct. It’s given that the equation x + y = 1,440 represents the number of minutes of daylight, x, and the number of minutes of non-daylight, y, on a particular day in Oak Park, Illinois. It’s also given that this day has 670 minutes of daylight. Substituting 670 for x in the equation x + y = 1,440 yields 670 + y = 1,440. Subtracting 670 from both sides of this equation yields y = 770. Therefore, this day has 770 minutes of non-daylight. Choice A is incorrect. This is the number of minutes of daylight, not non-daylight, on this day. Choice C is incorrect and may result from conceptual or calculation errors. Choice D is incorrect. This is the total number of minutes of daylight and non-daylight.

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