Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 7 - Exponents and Exponential Functions - 7-6 Exponential Functions - Practice and Problem-Solving Exercises - Page 457: 18


4 $\times$ $10^{4}$

Work Step by Step

You have f(x)=5000 $\times$ $2^{x}$.Where it represents the investment after x decades.Plug in x=3 since 30 years is 3 decades: f(3)=5000 $\times$ $2^{3}$ f(3)=40000 Put it into scientific notation form :4 $\times$ $10^{4}$
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