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the radius of a circle is 7n-21 inches. find the circunference of the circle in terms of N. Use 22/7 as an approximation for pi

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C = pi*2r = (22/7) * 2(7n-21)
C = (44/7) * (7n-21) = (308n - 924)/7 =
44n - 132

44n-132

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