Answer
3 double rolls
Work Step by Step
A=(9)(8)+(12)(8)
A=72+96
A=168 ft$^2$
n=$\frac{168}{60}$
n=2.8
You can't buy a fraction of a roll so 3 double rolls are needed.
Elementary Geometry for College Students (6th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
9781285195698
ISBN 13:
978-1-28519-569-8
Chapter 8 - Review Exercises - Page 385: 10a
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