A bag contains 8 green and 4 red identical balls. Two balls are selected at random one often the other without replacement. what is the probability that both are red? if the first ball is found to be green, what is the probability that the second ball is red.​

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