The mean of a set of four numbers is 3.5. if a fifth number, x, is added to the data set the mean becomes 4. what is the value of x.

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The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle

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