We are asked to find the length of 
, which measures 
. Using the segment addition postulate, we can add the two given expressions for 
and 
and make it equal to the expression for .
We've found the value of
, but we aren't done yet. We need to plug in the value we got for into the expression for , which is . Therefore, 
. Hope this helped and have a great day!
We've found the value of