4.) In a cage are a total of 40 cats and dogs, each one being black or white . Eleven of these animals are white, and 12 of the dogs are black. If there are 19 cats, how
many cats are white?

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