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OpenStudy (anonymous):
a rectangular building that measures 100m by 80m is to be surrounded by a lawn of uniform width. The area of the lawn must equal the area of the building. Find the width of the lawn, to the nearest tenth of a metre
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OpenStudy (anonymous):
I got up to \[w ^{2}+90w-2000\]
OpenStudy (anonymous):
Looks good to me. well done!
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