How Fast is the Radius Changing Spherical Balloon Related Rates

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In this video I do an example of a related rates word problem from calculus. The question is to determine how fast the radius is changing. This is the balloon problem.
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thank you! this really helped with my understanding, since my calculus course is now virtual with no in-person lectures!

GraceKrislyn
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can someone explain why attaching dr/dt when differenitation the volume formula is the chain rule and not implicit differentiation? or is it both?

juansalas