Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 2 - Multiplying and Dividing Fractions - 2.5 Multiplying Fractions - 2.5 Exercises - Page 149: 42

Answer

$\frac{21}{40} \ \text{mi} ^2$.

Work Step by Step

The area is computed by $A = a \cdot b$. Here, we substitute $a = \frac{7}{5}$ and $b=\frac{3}{8} $. From this it follows that the area $A$ is computed by: $A = a \cdot b = \frac{7}{5} \cdot \frac{3}{8} = \frac{7 \cdot 3}{5 \cdot 8} = \frac{21}{40}$. With considering the unit, the answer is $\frac{21}{40} \ \text{mi} ^2$.
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