Diane has a hospital appointment. when she arrives at the hospital, the car park is nearly full. there are a total of 534 car parking spaces but 476 are already occupied. how many spaces are available to park in?

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min