Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 11 - Section 11.4 - Partial Sums of Arithmetic and Geometric Sequences - Exercise Set - Page 659: 38

Answer

The distance she falls during the eighth second is $240 feet$. The total distance she falls during the first 8 seconds is $1024 feet$.

Work Step by Step

For the free fall, it can be represented by an arithmetic sequence, with $a_{1} = 16$ and $d = 32$, which the general term $a_{n} = 16 + (n - 1)(32)$ where $n$ is the number of seconds The distance she falls during the eighth second (n = 8) is $a_{8} = 16 + (8 - 1)(32) = 240 feet$. And, the total distance she falls during the first 8 seconds is $\sum\limits_{n=1}^8 a_{n} = \sum\limits_{n=1}^8 16 + (n - 1)(32)$ = $\frac{8}{2}(16 + 240)$ = $1024 feet$
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