To Find the IQR in a Box Plot, you take Q1-Q3?

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If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

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