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5Question: A marine safety consultant plans to coat a cylindrical oil containment drum with a hemispherical dome on top. If the cylinder has a radius of $ x $ units and a height of $ 3x $ units, what is the total surface area of the structure, excluding the bottom base of the cylinder? Express your answer in terms of $ \pi $ and $ x $.
To find the total surface area excluding the bottom base of the cylinder, we calculate the lateral surface area of the cylinder and the surface area of the hemispherical dome.