Finding the Area of a Composite Figure | Area of Composite Rectangles

When finding the missing length of C ( B ), isn't it 3 since 2+5=7 then 10 - 7 = 3??? Please help??

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Compound bro

What about the numbers left 6&10inces

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he is very understanding and helpful but i do advice that at C he use the area of a rectangle when it was a square which means the area was suppose to be SXS
im just trying to help those confused, im not judging his teaching at all. HE IS VERY GREAT AT HIS JOB and he has helped me alot.
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Also I'm not as accurate with these kinds of questions, so I think I really needed some bit of help with this probably

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38 sq in 2) 44sq cm

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