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

$x=1.63\times10^{19}$
Add $(7.2\times10^{18})$ to both sides. $x=9.1\times10^{18}+7.2\times10^{18}$ $x=(9.1+7.2)\times10^{18}$ $x=16.3\times10^{18}$ Write 16.3 in scientific notation. $16.3=1.63\times10^{1}$ $x=1.63\times10^{1}\times10^{18}=1.63\times10^{19}$