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What are the answers for 10-11...please show answer and need the answer asap..thank you

What are the answers for 10-11...please show answer and need the answer asap..thank-example-1

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Dear Rosabella09: For 9- Two possible dimensions are 8x15 and 10x20.
For 10- 16(8+18)1/2=208 208-(16x8/2)=208-64= [144 squared feet]
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