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Derivative applications challenge

A marshmallow has the shape of a cylinder and is expanding in the microwave at a rate of 10cm3sec10\,\dfrac{\text{cm}^3}{\text{sec}}. The height of the marshmallow is always three times the radius.
What is the rate of change of the radius when the radius is 2 cm2\text{ cm} ?
Choose 1 answer:
Choose 1 answer: