Answer
$A= \frac{21}{r}$
Work Step by Step
Since $A$ varies inversely with $r$, we have:
$A= \frac{k}{r}$
We are given: $A=7$ and $r=3$, so we have:
$7= \frac{k}{3}$
$k=7*3=21$
So the equation is:
$A= \frac{21}{r}$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 1, Equations and Graphs - Section 1.10 - Modeling Variation - 1.10 Exercises - Page 164: 21
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