Answer
$$\frac{23}{4}$$
Work Step by Step
We use the end of 2009 as time equals zero. Thus, using the equation for slope, we find that the rate of increase is:
$$ m=\frac{189-120}{12-0} \\ m=\frac{23}{4}$$
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 5 - Polynomials and Factoring - 5.6 Factoring: A General Strategy - 5.6 Exercise Set - Page 345: 90
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