Chapter 4 - Polynomials - 4.2 Negative Exponents and Scientific Notations - 4.2 Exercise Set - Page 245: 110

$2.914\times10^{-6}$

Using the laws of exponents and the concepts of scientific notation, the given expression, $ (4.7\times10^{5})(6.2\times10^{-12}) $, simplifies to \begin{array}{l} (4.7)(6.2)\times10^{5+(-12)} \\\\= 29.14\times10^{-7} \\\\= 2.914\times10^{-6} .\end{array}