Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$0.5\times10^{-12}$
Using the laws of exponents and the concepts of scientific notation, the given expression, $\dfrac{3.0\times10^{-2}}{6.0\times10^{10}}$, simplifies to \begin{array}{l} (3.0\div6.0)\times10^{-2-10} \\\\= 0.5\times10^{-12} .\end{array}