what abiotic factor is changing the ecosystem of Lake Washington, and how has this factor changed over time.

Can someone me do math because i am having a breakdown rn because i don’t get it

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

How much would it be worth in 5, 10, 20 years