Precalculus (6th Edition) Blitzer

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

Chapter P - Section P.2 - Exponents and Scientific Notation - Exercise Set - Page 31: 115

Answer

a. $3.18\times10^{12}$ b. $3.2\times10^{8}$ c. $9844$

Work Step by Step

a. A trillion can be written as $10^{12}$ and $3.18$ trillion can be expressed in scientific notation as $3.18\times10^{12}$ b. A million can be written as $10^{6}$ and $320=3.2\times10^2$ million can be expressed in scientific notation as $3.2\times10^{6+2}=3.2\times10^{8}$ c. Using division for the average, we have $\frac{3.18\times10^{12}}{3.2\times10^{8}}\approx0.9938\times10^4\approx9938$ dollars per person.
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