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 660: 60

Answer

A situation in everyday life that can be modeled by an infinite geometric series is playing a swing in the park in calculating the total height attained for all the swings before the swing comes to a complete stop.

Work Step by Step

A situation in everyday life that can be modeled by an infinite geometric series is playing a swing in the park in calculating the total height attained for all the swings before the swing comes to a complete stop. Suppose the initial height reached by a kid for the first swing is 6 feet above the ground and for each of the subsequent height attained after he completed a swing, the height falls to $\frac{3}{4}$ of the previous one. The total height he attained during all his swings before the swing comes to a complete stop is equal to the total sum of all the terms of the infinite geometric series with $a_{1} = 6$ and $r = \frac{3}{4}$ whose general term $a_{n} = 6(\frac{3}{4})^{n - 1}$ with n = number of swings in the series. The total height attained for all his swings before the swing comes to a complete stop is equal to $\frac{6}{1 - \frac{3}{4}}$ = $24$ feet
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