Answer:
D) x+y=12, x=2y
Step-by-step explanation:
We know that x+y=12 and x=2y given the word problem, so D is correct.
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Make use of the known limit,

We have

since
, and the limit of a product is the same as the product of limits.
is continuous at
, and
. The remaining limit is also 1, since

so the overall limit is 1.