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A cuboid has a rectangular cross section where the length of the rectangle is equal to twice its width x cm. THe volume is 81 cm^3. a) show that the total length L cm of the cuboid is given by L=12x+162/x^2

Volume=81 cm3 

b=81/2x2 

L=4x+4(2x)+ 4(b)

L=4(x)+4(2x)+4(81/2x2) 

L=12x+ 162/x2

BT

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