Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 7 - Section 7.3 - Adding and Subtracting Rational Expressions with the Same Denominator - Exercise Set - Page 508: 73

Answer

$a.\displaystyle \quad\frac{100W}{L}$ $b.\quad $round skull

Work Step by Step

$a.$ $\displaystyle \frac{L+60W}{L}-\frac{L-40W}{L}=$ To add/subtract rational expressions with the same denominator, add/subtract numerators and place the sum/difference over the common denominator. = $\displaystyle \frac{L+60W-(L-40W)}{L}$ = $\displaystyle \frac{L+60W-L+40W}{L}$ = $\displaystyle \frac{100W}{L}$ $b.$ With W=5 and L=6, we evaluate $\displaystyle \frac{100\times 5}{6}=\frac{500}{6}=83\frac{1}{3}.$ This is over 80, the skull is round.
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