We are given the following information
Driving distance between Los Angeles and Phoenix = 600 km
Driving distance between Phoenix and Chicago = 2.3 x 10^3 km
[tex]2.3\times10^3=2300[/tex]How far will you have to travel if you drive from Los Angeles to Phoenix and then from Phoenix to Chicago?
Simply add up both distances.
[tex]\begin{gathered} distance=600\: +2300 \\ distance=2900\: km \end{gathered}[/tex]The answer in scientific notation is given by
[tex]distance=2900=2.9\times10^3\: km[/tex]Therefore, you will travel 2.9 x 10^3 or 2900 km if you drive from Los Angeles to Phoenix and then from Phoenix to Chicago.