Answer
Sum
Work Step by Step
The sum of the first n terms of an arithmetic sequence can be calculated as:
$\frac{n}{2}(a_1+a_n)$
Here:
$\frac{4}{2}(5+11)$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 14 - Sequences, Series, and the Binomial Theorem - 14.2 Arithmetic Sequences and Series - 14.2 Exercise Set - Page 902: 4
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