Answer
$10,20,40$.
Work Step by Step
We see that
$80/5=16=2^4$
Thus, if $a_1=5$ and $a_5=80$, then the common ratio must be $2$. So the three geometric means are
$5(2)=10,5(2)^2=30,5(2)^3=40$.
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 8, Sequences and Series - Section 8.3 - Geometric Sequences - 8.3 Exercises - Page 616: 83
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