For a walkathon a sponsor committed to give you a flat fee $5 plus $2 for every mile m you walk. A. write an expression for the total amount you will collect from your sponsor at the end of the walkathon

B. then evaluate your expression for 20 miles walked

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