Answer
$a_7=20480$
Work Step by Step
$a_1=5$
$r=\frac{a_2}{a_1}=\frac{a_3}{a_2}$
$r=\frac{20}{5}=\frac{80}{20}=4$
$a_n=a_1r^{n-1}$
$a_7=5(4)^{7-1}=5(4)^6=5(4096)=20480$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11 - 11.3 - Geometric Sequences and Series - 11.3 Exercises - Page 795: 40
Update this answer!
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.
