It takes 12 hours to drain a storage tank by opening the valve at the bottom. The

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It takes 12 hours to drain a storage tank by opening the valve at the bottom. The depth y of fluid in the tank t hours after the valve is opened is given by the formulaimage


a. Find the rate dy/dt (m/h) at which the tank is draining at time t.


b. When is the fluid level in the tank falling fastest? Slowest? What are the values of dy/dt at these times?


c. Graph y and dy/dt together and discuss the behavior of y in relation to the signs and values of dy/dt.

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Thomas Calculus Early Transcendentals

ISBN: 9780321884077

13th Edition

Authors: Joel R Hass, Christopher E Heil, Maurice D Weir

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