Answer
The instructor teaches Math.
Work Step by Step
We see that all of the books on the teacher's shelf are Math textbooks. Since all of the books are Math textbooks, we would conclude that the teacher teaches Math.
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter P - Preliminary Concepts - P.2 - Statement and Reasoning - Exercises P.2 - Page 15: 39
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