College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 6 - Section 6.4 - Logarithmic Functions - 6.4 Assess Your Understanding - Page 452: 140



Work Step by Step

General formula for average rate of change from x to y: $\frac{f(y)-f(x)}{y-x}.$ Hence here: $\frac{f(1)-f(0.5)}{1-0.5}=\frac{9^1-9^{0.5}}{0.5}=\frac{9-3}{0.5}=12.$
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