Answer
$ f'''(4)=0$.
Work Step by Step
Since $ f(t)=2t^2-t $, then we get
$$ f'(t)=4t-1, \quad f''(t)=4, \quad f'''(t)=0.$$
Hence, $ f'''(4)=0$.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 3 - Differentiation - 3.5 Higher Derivatives - Exercises - Page 135: 22
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