Big Ideas Math - Algebra 1, A Common Core Curriculum

Published by Big Ideas Learning LLC
ISBN 10: 978-1-60840-838-2
ISBN 13: 978-1-60840-838-2

Chapter 6 - Exponential Functions and Sequences - 6.7 - Recursively Defined Sequences - Monitoring Progress - Page 341: 4

Answer

The sequence is $0.7,7,70,700,7000,70000,...$ The graph is shown below.

Work Step by Step

First term $a_1=0.7$ Recursive equation $a_n=10a_{n-1}$ Use the recursive equation to find the next five terms. $\Rightarrow a_2=10a_{2-1}=10a_{1}=10(0.7)=7$ $\Rightarrow a_3=10a_{3-1}=10a_{2}=10(7)=70$ $\Rightarrow a_4=10a_{4-1}=10a_{3}=10(70)=700$ $\Rightarrow a_5=10a_{5-1}=10a_{4}=10(700)=7000$ $\Rightarrow a_6=10a_{6-1}=10a_{5}=10(7000)=70000$ Use table to organize the terms. Plot the ordered pairs $(n,a_n)$.
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