Answer
$r=2.7 $
Work Step by Step
We see that the variable only appears once and is in the numerator, so we know that the Multiplication Property of Equality will work well. We multiply both sides of the equation by 2.1 to obtain that $r=2.7$.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 2 - Solving Equations - 2-7 Solving Proportions - Practice and Problem-Solving Exercises - Page 128: 45
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