Answer
$1.38*10^9$
Work Step by Step
We are given the population of the United States as $3.0*10^8$. We multiply this by $4.6$ pounds, so we have $3.0(4.6)*10^8$, or $13.8*10^8$. We move the decimal point one place to the left and raise the exponent by $1$, resulting in $1.38*10^9$.
