Answer
$P=10.1W$
Work Step by Step
To find power, the formula relating power, intensity, and distance from a source must be used. This formula is $$I=\frac{P}{A}=\frac{P}{4\pi R^2}$$ Solving for power leaves $$P=4\pi R^2I$$ Substituting known values of $R=10m$ and $I=0.0080W/m^2$ yields $$P=4\pi(10m)^2(.0080W/m^2)=10.1W$$
