Point D is on line segment CE. Given CE=11 and CD=9, determine the length DE

Answer :

11
•——-•——•
C D E
9 2
Because the line CE is 11, you will need to subtract it by 9 to find line DE.
11-9=2
To check your work you may add 9 and 2 to find out if it comes out to 11 and it does.