Which term could be put in the blank to create a fully simplified polynomial written in standard form? 8x3y2−+3xy2−4y3

x2y2
x3y3
7xy2
7x0y3

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