Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 12 Sequences and Series - 12.1 Define and Use Sequences and Series - Guided Practice for Examples 5 and 6 - Page 797: 14


285 apples

Work Step by Step

There are nine terms, ( $\displaystyle \sum_{n=1}^{9}$ ... ) and the nth term is $n^{2}$ (apples in nth layer) $\displaystyle \sum_{n=1}^{9}n^{2}=1^{2}+2^{2}+3^{2}+4^{2}+5^{2}+6^{2}+7^{2}+8^{2}+9^{2}$ $=1+4+9+16+25 +36+49+64+81$ $=285$ Total: 285 apples in the stack.
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