Question

3 if point c is between points a and b, then ac + ___ = ab.
a. ca
b. cb
c. abc
d. ab

Explanation:

If point \( C \) is between points \( A \) and \( B \), by the segment addition postulate, the sum of the lengths of \( AC \) and \( CB \) should equal the length of \( AB \). So \( AC + CB=AB \). Option A (\( CA \)) is the same as \( AC \) (just reversed), adding it to \( AC \) would not give \( AB \). Option C (\( ABC \)) is not a segment length in the context of this problem, and option D (\( AB \)) when added to \( AC \) would not equal \( AB \) (it would be \( AC + AB\), which is longer than \( AB \)).

Answer:

B. CB