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Kanti · Answer 1 · 2019-11-09T20:34:50+0000

That would be A. The units multiply and divide just like the numbers:

$12000 \textrm{ feet} * \frac{1 \textrm{ mile}}{5280 \textrm{ feet}}$

We need feet in the denominator of our scale factor to cancel with the feet we're multiplying by, and miles in the numerator so it becomes the unit of our result.

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