Prealgebra (7th Edition)

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

Chapter 6 - Section 6.2 - Proportions - Exercise Set: 48

Answer

$n=28$

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 $b \cdot c$. $-0.2*n=-8*0.7$ $-0.2n=-5.6$ $-0.2n\div-0.2=-5.6\div-0.2$ $n=28$
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