A cable that weighs 4 lb/ft is used to lift 600 lb of coal up a mine shaft 400 ft deep. Find the work done. Show how to approximate the required work by a Riemann sum. (Let x be the distance in feet below the top of the shaft. Enter x,* as x₁.) lim n18 i=1 Ax Express the work as an integral. Dax Evaluate the integral. ft-lb

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