Answer
4; 8
Work Step by Step
For every 4 (dollar) increase in price, sales of cell phones decrease by 8 units.
Because $85-81=4$
and $111-103=8$
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 1 - Section 1.3 - Linear Functions and Models - Exercises - Page 91: 85b
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