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If the area is 10000m2, each side has length 100m Therefore the perimeter is 4*100m = 400m
14m x 8m x 6m = 672 m^3
Area of rectangle = length * width = 9*8 = 72 metres2
8m + (4n - 6m) + 9n =8m + 4n - 6m + 9n =(8m - 6m) + (4n + 9n) =2m + 13n