Answer
Concave down.
Work Step by Step
The rate of change seems to be getting less positive (tending to zero as $x$ grows), therefore the graph is concave down.
Functions Modeling Change: A Preparation for Calculus, 5th Edition
by Connally, Eric; Hughes-Hallett, Deborah; Gleason, Andrew M.; Cheifetz, Phil C.
Published by
Wiley
ISBN 10:
1118583191
ISBN 13:
978-1-11858-319-7
Chapter 2 - Functions - 2.6 Concavity - Exercises and Problems for Section 2.6 - Exercises and Problems - Page 106: 4
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