Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Appendix C - Exercise Set: 27



Work Step by Step

$(4\times10^{-10})(7\times10^{-9})$ $\longrightarrow$ associative property =$(4\times7)(10^{-10}\times10^{-9})$ $\longrightarrow$ multiply; add exponents if the base is the same =$28\times10^{-19}$ $\longrightarrow$ move the decimal 19 places to the left =$0.0000000000000000028$
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