Answer
4.0$\times$$10^{4}$ km is the length of the equator
Work Step by Step
Length = $\frac{1.9\times10^{-5}km}{1 penny}$ $\times$ $\frac{2.1\times10^{9}pennies}{1 round}$
= 39900 km = 3.99$\times$$10^{4}$ km = 4.0$\times$$10^{4}$ km
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 7 - Exponents and Exponential Functions - 7-2 Multiplying Powers With the Same Base - Lesson Check - Page 429: 4
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