## Algebra 1: Common Core (15th Edition)

Published by Prentice Hall

# Chapter 7 - Exponents and Exponential Functions - 7-8 Geometric Sequences - Lesson Check - Page 470: 4

#### Answer

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#### Work Step by Step

The starting value $a_1$ is 5. The common ratio $r$ is $\frac{20}{5}=4$. The recursive formula is: $a_1=5; a_n=a_{n-1}.4$ The explicit formula is: $a_n=5.4^{n-1}$

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