Prealgebra (7th Edition)

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

Chapter 4 - Section 4.5 - Adding and Subtracting Unlike Fractions - Exercise Set - Page 274: 77

Answer

$\frac{34}{15}$ or $ 2 \frac{4}{15}$

Work Step by Step

The formula for the perimeter of a parallelogram is $ P= 2 (a + b)$ $a$ is the side, and $b$ is the base. The side is: $\frac{1}{3}$ The base is $\frac{4}{5}$ $ P= 2 ( \frac{1}{3} + \frac{4}{5})$ The least common multiple of the denominators is 15. Adjust the fractions based on the least common multiple. For the first fraction, multiply the numerator and denominator by 5. $ \frac{1}{3} \times \frac{5}{5}= \frac{5}{15}$ For the second fraction, multiply the numerator and denominator by 3. $\frac{4}{5} \times \frac{3}{3}= \frac{12}{15}$ $ \frac{5}{15}+ \frac{12}{15}= \frac{17}{15}$ Insert this value into the perimeter formula: $ P= 2 (\frac{17}{15})= \frac{2\times 17}{15}= \frac{34}{15}= 2 \frac{4}{15}$
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