A cable that weighs 8 Ib/ft is used to lift 900 Ib of coal up a mine shaft 450 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 Ax i= 1 Express the work as an integral. Evaluate the integral. ft-lb

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