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Jacobpm64

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(a) How fast is the area of the slick expanding?

(b) The circular slick has the same thickness everywhere, and the volume of oil spilled remains fixed. How fast is the thickness of the slick decreasing?

Part B is easy, I just used a cylinder and figured it out. I'm sure I got it correct.

Part A is where I'm confused. When they say area, I wonder do they mean just the surface area of the top of the slick (a circle), or the surface area of the entire cylinder?

What do you people think?