Answer
10 (dollar); 39
Work Step by Step
For every 10 (dollar) increase in price, sales of smart phones decrease by 39 units.
Because $162-152=10$ and $213-174=39$
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 92: 86b
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