#### Answer

True

#### Work Step by Step

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 $b \cdot c$.
$4.2*10=5*8.4=42 \rightarrow$ true

Published by
Pearson

ISBN 10:
0321955048

ISBN 13:
978-0-32195-504-3

True

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