A tractor pull contest is held at a county fair. The tractors in the contest pull a sled on which two more people get on every 10 feet. The force function to move the sled every x feet is given by F(x) = 400x+1500 lbs.   How much work (in ft-lb) is required to pull the sled 50 feet?   Note: Enter your answer without the use of decimals or commas

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