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The answer is 15 like its given (2x+1) length and X is width .whereas X = 2.5 so the surface area of a box is Length X Width. putting the value of X = 2.5 in (2X2.5 +1)(2.5)=15

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Q: Length of a box 2x plus 1 width is x. x equals 2.5 What is the surface area?
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