Answer
21
Work Step by Step
Recall that for any constant c, $\lim\limits_{x \to c}x=c$
Therefore, $\lim\limits_{x \to 21}x=21$.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 2 - Limits - 2.2 Limits: A Numerical and Graphical Approach - Exercises - Page 54: 7
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