Answer
$n=\dfrac{2S}{a+L}$
Work Step by Step
Using the properties of equality, in terms of $
n
,$ the given equation, $
S=\dfrac{n(a+L)}{2}
,$ is equivalent to
\begin{array}{l}
2S=n(a+L)
\\\\
\dfrac{2S}{a+L}=n
\\\\
n=\dfrac{2S}{a+L}
.\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 6 - Section 6.6 - Rational Equations and Problem Solving - Exercise Set - Page 387: 7
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