Answer
$ 6.72\ ft$
Work Step by Step
We solve for $w$ and then plug in the given values to obtain:
$$
A=lw\Longrightarrow w=\frac{A}{l}=\frac{84.0}{12.5}= 6.72\ ft
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 6 - Section 6.8 - Substituting Data into Formulas - Exercises - Page 259: 23
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