## Algebra 2 (1st Edition)

Published by McDougal Littell

# Chapter 12 Sequences and Series - 12.1 Define and Use Sequences and Series - Guided Practice for Examples 2 and 3 - Page 795: 5

#### Answer

$81$

#### Work Step by Step

The rule that emerges from the pattern is $a_{n}=n^{2}$ When n=9, $a_{9}=9^{2}=81$ There are 81 apples in the 9th layer.

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