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OpenStudy (anonymous):
Jon's new mini computer monitor has a 20 cm by 24 cm LCD screen with a plastic trim border. The total area of the monitor and border is 672 cm2. How wide is the trim around the monitor?
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OpenStudy (fifciol):
|dw:1373376747364:dw|\[(20 + 2x)(24+2x)=672\] solve for x choosing positive value from your quadratic equation. Ans x=2
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