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HallsofIvy, Coutrigrad, and Aero, thank you :)

Aero, thank you so much ! :D

Thank you. But if you multiply those, how would it give you the volume? Doesn't the product become the area? I don't understand why h-(1.565-x^2)^1/2 is being subtracted from 1.25-h. Can someone please tell me why?

courtrigrad, thank you very much for your reply. but i was wondering where "dx" came from; does "d" represents the diameter?

HallsofIvy, thank you very much for your reply. I had realized that the gasoline doesn't form cylinders of decreasing radius too, but I couldn't figure out how to express it. We have not learned the "fundamental theorem of calculus" yet. Is it possible to calculate it in another way without...

please help me with this assignment question. Q: gasoline is pumped from the tank of a tanker truck at a rate of 20L/s. if the tank is a cylinder 2.5 m in diameter and 15 m long, at what rate is the level of gasoline falling when the gasoline in the tank is 0.5m deep? express in exact answer...