Intermediate Algebra (6th Edition)

Published by Pearson

Chapter 11 - Section 11.2 - Arithmetic and Geometric Sequences - Exercise Set: 17

Answer

$a_{25}=-28$

Work Step by Step

Using $a_n=a_1+(n-1)d$ or the $n$th term of an arithmetic sequence, then, \begin{array}{l} a_{25}=20+(25-1)(-2) \\ a_{25}=20-48 \\ a_{25}=-28 .\end{array}

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