Need help on these 4 math problems:

How much work is done by a variable force F(x) = (47 - x) N that moves an object along a straight line in the direction of F from x = 8 m to x = 19 m? (Use symbolic notation and fractions where needed.) W =How much work is done by a variable force FOE) : g N that moves an object along a straight line in the direction of F from x:?mtox:lm? (Express numbers in exact form. Use symbolic notation and fractions where needed.) wI A swimming pool is in the shape of a rectangular parallelepiped 8 ft deep, 48 ft long, and 22 ft wide. It is filled with water to a depth of 7 ft. How much work is required to pump all the water over the top? The weight of water per cubic foot is pg = 62.43 1b/ft3. (Round your answer to the nearest whole number.) W ~ ft.lbA 33 m chain weighing 4 kg/m hangs over the side of a bridge. How much work is done by a winch that winds the entire chain in? (Use decimal notation. Give your answer to one decimal place.) W= J