calculus
posted by john .
a splenical ballon is being inflated @ 10 cubic inches per secound. how fast is the radius of the ballon increasing when the surface area of the ballon is 2 pi square inches( answer to 4 decimal places)?

I once had a splenical balloon. It was almost spherical.
With that in mind,
v = 4/3 pi r^3
dv/dt = 4 pi r^2 dr/dt
so, plug and chug
10 = 2 pi dr/dt
dr/dt = 10/2pi = 1.5915 in/s
Note: surface area is 4pi r^2
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