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the absolute value of the quantity of 5 plus a number equals 10If the sum of a number and four is doubled, the result is one less than the number. Find the number.: x=\squareFind the area of a 円 with a radius of 8.what sit he result when the number 50 decreased by 10%the curved surface of a circular cone can be folded out to form a semicircle with the 直径 20cm , find the volume of the cone