Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 2 - Section 2.5 - Formulas and Problem Solving - Exercise Set: 9

Answer

$r=2.5$

Work Step by Step

$C=2\pi r;$ $C=15.7$ Substitute known values. (Let $\pi=3.14$) $15.7=2(3.14)r$ Solve for $r$ by dividing both sides of the equation by $2(3.14)$: $\dfrac{15.7}{2(3.14)}=\dfrac{2(3.14)r}{2(3.14)}$ $r=\dfrac{15.7}{2(3.14)}=2.5$
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