Answer
$f(12)=5.$
Work Step by Step
General formula for average rate of change from x to y: $\frac{f(y)-f(x)}{y-x}.$ Hence here: $\frac{f(12)-f(0)}{12-0}=\frac{3}{8}\\\frac{f(12)-0.5}{12}=\frac{3}{8}\\f(12)-0.5=4.5\\f(12)=5.$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 8 - Section 8.4 - Matrix Algebra - 8.4 Assess Your Understanding - Page 601: 101
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