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A construction worker is pouring concrete stairs. The first step requires 1.8 cubic feet of concrete, and the first 5 steps require a total of

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A construction worker is pouring concrete stairs. The first step requires 1.8 cubic feet of concrete, and the first 5 steps require a total of 27 cubic feet. If the steps follow an arithmetic series, how much concrete is required for the first 12 steps? 0 259.2 cubic feet 0 43.2 cubic feet 0 156 cubic feet 0 140.4 cubic feet

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