A stone is dropped into a lake, creating a circular ripple thattravels outward at a speed of 60 cm/s.(a) Express the radius of this circle as a function of thetime t(in seconds).(b) If A is the area of this circle as a function of the radius,find A °r and interpret it.

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
1st Edition
ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
Publisher:HOUGHTON MIFFLIN HARCOURT
Chapter10: Radical Functions And Equations
Section: Chapter Questions
Problem 15CT
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A stone is dropped into a lake, creating a circular ripple that
travels outward at a speed of 60 cm/s.
(a) Express the radius of this circle as a function of the
time t(in seconds).
(b) If A is the area of this circle as a function of the radius,
find A °r and interpret it.

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