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: 25

Answer

$W= \frac{360}{r^{2}}$

Work Step by Step

Since $W$ is inversely proportional to the square of $r$, we have: $W= \frac{k}{r^{2}}$ We are given: $W=10$ and $r=6$, so we have: $10= \frac{k}{6^{2}}$ $k=36*10=360$ So the equation is: $W= \frac{360}{r^{2}}$
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