Respuesta :

The question is asking to state in complete sentence and describe the sum of CA and AB, base on my calculation, if it is in a number line, the sum of CA and AB, is the distance between C and B. I hope you are satisfied with my answer and feel free to ask for more if you have questions and further clarifications 

the right answer is CA + AB = CB because this question was asking you to describe the SUM of the two lines. Thank me later fam.