Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 7 - Exponents and Exponential Functions - 7-8 Geometric Sequences - Practice and Problem-Solving Exercises - Page 472: 56

Answer

Answer D

Work Step by Step

The starting value $a_1$ is $12$. The common ratio $r$ is $\frac{18}{12}=\frac{3}{2}$. The explicit formula is: $ a_n=12.(\frac{3}{2})^{n-1}$ Thus, the correct answer is D.
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