Chapter 5 - Section 5.7 - Negative Exponents and Scientific Notation - Exercise Set - Page 409: 97

$6.751\times10^{3}$

Using $a\times10^n$, where $1\le a\le9,$ and $n$ is an integer, the scientific notation of the given expression, $ 6751 ,$ is \begin{array}{l}\require{cancel} 6.751 \times1000 \\\\= 6.751\times10^{3} .\end{array}