Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 3 - Section 3.5 - Exponential Growth and Decay; Modeling Data - Exercise Set - Page 507: 39


Very well.

Work Step by Step

Use the given model function $f(x)=\frac{12.57}{1+4.11e^{-0.026x}}$ For year 2010, we have $x=2010-1949=61$ and $f(61)=\frac{12.57}{1+4.11e^{-0.026(61)}}\approx6.826$ billion As this number is close to $6.9$ billion, the model fits the data very well.
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