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Verified Answer :

Moonnose

When all three are put together you get a rectangle. Therefore we can use this formula to solve it:
A=lw
=(10.5+12)×15
=22.5×15
=337.5 ft^2

This means C is the answer. Hope this helps.

the answer would most definably be 337.5 squared because you are multiplying length by width (l*w) to find area. And since this isn't an algebraic expression, and doesn't include a unidentified variable, you just have to add 10.5ft and 12ft, then multiply this product by 15ft, to get 337.5ft squared.

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