Answer
$28\times10^{-19}=.0000000000000000028$
Work Step by Step
$(4\times10^{-10})(7\times10^{-9})=4\times7\times10^{-10}\times10^{-9}=28\times10^{-10+(-9)}=28\times10^{-19}=.0000000000000000028$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Section 5.2 - Negative Exponents and Scientific Notation - Exercise Set - Page 355: 99
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