Answer
$ 24.6\times10^{5} m$
![](https://gradesaver.s3.amazonaws.com/uploads/solution/aa97ae61-ecef-4fb0-84c7-2ac980a7c83a/result_image/1673554919.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJVAXHCSURVZEX5QQ%2F20240908%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240908T000219Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=bebf83a31bbc63ec4d190ef5cd6de01b1730e6d9cf768a884664a0ea5556dc77)
Work Step by Step
When we are adding two physical quantities both of them should have the same units. Therefore we can convert kilometers into meters as follows.
$2.1\times10^{3} km = 2.1\times10^{3}\times10^{3} m = 2.1\times10^{6} m$
Then,
$3.6\times10^{5} m + 2.1\times10^{3} km = 3.6\times10^{5} m + 2.1\times10^{6} m = (3.6\times10^{5} + 21\times10^{5}) m$
$=(3.6+21)\times10^{5} m$
$=24.6\times10^{5} m$
![](https://gradesaver.s3.amazonaws.com/uploads/solution/aa97ae61-ecef-4fb0-84c7-2ac980a7c83a/steps_image/small_1673554919.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJVAXHCSURVZEX5QQ%2F20240908%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240908T000219Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=b968a484d086a4a2083517bd1dc082d11244572dbdcc093751e8ff5b12b630db)