Suppose that a is the area of a disc with radius r which is expanding in time t measured in seconds. (a) Express da/dt in terms of r and dr/dt (b) Suppose an oil tanker is leaking oil which spreads in the shape of a disc on the surface of the ocean. If the radius increases at a rate of 1m/s, how fast does the area of the spill increase when the radius is 30m?

Functions and Change: A Modeling Approach to College Algebra (MindTap Course List)
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Author:Bruce Crauder, Benny Evans, Alan Noell
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Chapter2: Graphical And Tabular Analysis
Section2.1: Tables And Trends
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Suppose that a is the area of a disc with radius r which is expanding in
time t measured in seconds.
(a) Express da/dt in terms of r and dr/dt
(b) Suppose an oil tanker is leaking oil which spreads in the shape of a
disc on the surface of the ocean. If the radius increases at a rate of
1m/s, how fast does the area of the spill increase when the radius is
30m?

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