Answer
$6.4\times10^{4}$
Work Step by Step
$(1.6\times10^{15})$$(4\times10^{-11})$
=$(1.6\times4.1\times10^{15}\times10^{-11})$
= $6.4\times10000$
=$64000$
=$6.4\times10^{4}$
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