rates

[pringless]

A right circular cone is inscribed in a hemisphere. The figure is expanding in such a way that the combinded surface area of the hemisphere and its base is increasing at a constant rate of 18 in^2 per second. At what rate is the volume of the cone changing when the radius of the common base is 4 in?

how do i do this can anyone help?

[StephenPrivitera]

Can you show me how far you've gotten so far? I could help you finish the problem if you get me started.

[gammamcc]

related rates

[HallsofIvy]

I'm moving this to the homework section. Pringless, what have you done on this?