Answer
With the exception of 2007 ($x=4$), the values of the two tables are the same.
Work Step by Step
I would conclude that the import supply is the difference between the total supply and the domestic supply.
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Group Activity - Modeling with Polynomials - Page 399: 3
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