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posted by Lizzie on Friday, July 27, 2012 at 5:59am.
A square painting is surrounded by a 3-cm-wide frame. If the total area of the painting plus the frame is 81 cm2, find the dimensions of the painting.
Let painting height/width be x. (x+6)^2 = 81 x + 6 = 9 x = 3
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