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05-07-2018
Mathematics

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the area of a square piece of cardboard is 81 square inches

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05-07-2018

Lets x = side of square
Area of square = side times side = x * x = x^2

Given:
Area = 81 square inches
so
A = x^2
81 = x^2
x = √81
x = 9

Answer
side = 9 inches

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