College Algebra 7th Edition

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


$A= \frac{21}{r}$

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: $A= \frac{21}{r}$
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