a stone is dropped in a lake, creating a circular ripple that travels outward at a speed of 80 cm/s.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.2: Graphs Of Equations
Problem 45E
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a stone is dropped in a lake, creating a circular ripple that travels outward at a speed of 80 cm/s. 

a) find a function g that models the radius as a function of time t, in seconds.

g(t)=  

b) find a function f that models the area of the circle as a function of the radius r, in cm

f(r)= 

c) find f ° g

f ° g=

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