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

Published by Prentice Hall

# Chapter 7 - Exponents and Exponential Functions - 7-8 Geometric Sequences - Practice and Problem-Solving Exercises - Page 470: 15

#### Answer

Geometric, ratio=2

#### Work Step by Step

You have the sequence:10,20,40,80. Find the common ratio by using the formula: R=$\frac{a2}{a1}$,R=$\frac{a4}{a3}$.Plug in the values to get the ratios: r=$\frac{20}{10}$=2 r=$\frac{80}{40}$=2 There is a common ratio, r=2. So the sequence is geometric.

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