Noise in a quiet room is 500 times as intense as the threshold of sound. What is the decibel measurement for the quiet room? 20 decibels
28 decibels
200 decibels
280 decibels

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