posted by Vivian .
Don't understand how to solve this problem:
12. A, B, C, and D are points on a line, and the lengths of the line segments are: AB = 12, BC = 4, CD = 7, and DA = 15. Which of the following is a possible order for the points?
since AD=15 and AB=12, I'd say you have
Now, if C is 4 to the left of B, we have
So, choice (D)