Answer
$d=\frac{L-a}{n-1}$
Work Step by Step
We are given that $L=a+(n-1)d$. We can solve for d by first subtracting a from each side.
$L-a=(n-1)d$
Divide both sides by n-1.
$d=\frac{L-a}{n-1}$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 2 - Section 2.3 - Formulas and Problem Solving - Exercise Set - Page 73: 22
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