Answer
$2.1 \times 10^{-6}$
Work Step by Step
Move the decimal point 3 places to the left to get 2.1.
Then, multiply the original power of 10 by $10^{3}$ to retain the original value.
$=2.100 \times 10^{-9+3}
\\=2.1 \times 10^{-6}$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 5 - Number Theory and the Real Number System - 5.6 Exponents and Scientific Notation - Exercise Set 5.6 - Page 320: 77
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