## Intermediate Algebra for College Students (7th Edition)

$x=4\times10^{5}$
$x=\frac{1.2\times10^{4}}{3\times10^{-2}}$ $x=(\frac{1.2}{3})\times(\frac{10^{4}}{10^{-2}})$ $x=0.4\times10^{4-(-2)}=0.4\times10^{6}$ Write 0.4 in scientific notation. $0.4=4\times10^{-1}$ $x=4\times10^{-1}\times10^{6}=4\times10^{5}$