Suppose the same hot air balloon begins descending at a rate of 20ft/ min from an elevation of 1350 ft

At a sand and gravel plant, sand is falling off a conveyor and onto a conical pile at a rate of 16 cubic feet per minute. the diameter of the base of the cone is approximately three times the altitude. at what rate is the height of the pile changing when the pile is 12 feet high? (hint: the formula for the volume of a cone is v = 1 3 πr2h.)

True or false? a circle could be circumscribed about the quadrilateral below.

How can you find the mean absolute deviation (mad) for this set of data?