Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 6 - Section 6.2 - Proportions - Exercise Set: 47

Answer

$n=25$

Work Step by Step

We are trying to solve for the given variable so that the proportion is true. To determine if a proportion is true, we have to find if the cross products are equal. The cross products of $\frac{a}{b}=\frac{c}{d}$ are $a \cdot d$ and $b \cdot c$. $-3.5*n=(-7)*12.5$ $-3.5n=-87.5$ $-3.5n\div-3.5=-87.5\div-3.5$ $n=25$
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