Question

Can somebody give the answer and help explain how they got it?

Answer 1

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.

Answer 2

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.