The price of an article on sale was 70% of the regular price. If the sale price was $28, what was the regular price?
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The original area of a face would be a^2. Now that you added b to the edge, the new area of each face would be (a+b)^2. To find how much the are increased, subtract a^2 from (a+b)^2. So the answer is b(2a+b)