Answer
$\sum_{k=0}^{n}(a+kd)$
Work Step by Step
We can see that this is the sum of $n$ terms in which the first term is $a$ and $(n-1)$ times $d$ gets added to the nth term. Hence the summation formula is: $\sum_{k=0}^{n}(a+kd)$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 12 - Sequences; Induction; the Binomial Theorem - 12.1 Sequences - 12.1 Assess Your Understanding - Page 807: 67
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