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Emilio owns a bakery. The number of boxes of cookies he has left on a Monday is represented by the function x + y = 42, where y is the number of boxes of cookies remaining in the bakery and x is the number of hours since he opened the bakery. How many boxes did he have at the start of business on Monday? (Note: x ≥ 0, y ≥ 0, and y takes only integer values.) A. 46 B. 40 C. 42 D. 38

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Answer:

C. 42

Explanation:

Since the bakery just opened, then x = 0, so if you plug 0 in for x in x + y = 42 then you just get y = 42

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