- - - - -_1,440 -_represents - -_the_number - ~ x+y = The equation 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?
Correct answer: B (parsed from the explanation — this source omits an answer key for this item)
Explanation
+ =1,440 Choice B is correct. It’s given that the equation x y 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 670 670 + 1= ,440 minutes of daylight. Substituting for x in the equation x y 670+ =1,440 670 yields y . Subtracting from both sides of this equation yields =770 770 y . Therefore, this day has 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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