Answer
zero
Work Step by Step
A person's I.Q. is not expected to change during his or her sleep.
Thus, the rate at which a a person's I.Q. changes during a a person's sleep must be zero.
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 3 - Introduction to Graphing - 3.5 Slope - 3.5 Exercise Set - Page 196: 11
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