Answer
$6.4\times10^{4}$
Work Step by Step
$$(1.6\times10^{15})(4\times10^{-11})$$
Regroup like terms then simplify
$$=(1.6\times4)(10^{15}\times10^{-11})$$
$$=6.4\times10^{(15+(-11))}$$
$$=6.4\times10^{4}$$
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