Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 1 - Section 1.7 - Modeling with Equations - 1.7 Exercises - Page 79: 77

Answer

$6.4$ft or $6\frac{2}{5}$ft

Work Step by Step

The formula given to us is very simple: $w_{1}*x_{1} = w_{2}*x_{2}$ We know: $w_{1} = 100$ $x_{1} = 8$ $w_{2} = 125$ So lets plug that into our equation and solve: $100*8 = 125*x$ $800 = 125x$ $\frac{800}{125} = x$ $6.4 = x$
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