Question

if c is between a and b then ac + cb = ab. sometimes always never

Explanation:

By the Segment Addition Postulate in geometry, if a point \( C \) lies between points \( A \) and \( B \) on a line segment, then the sum of the lengths of \( AC \) and \( CB \) is equal to the length of \( AB \), i.e., \( AC + CB=AB \). This is a fundamental postulate, so the statement is always true.

Answer:

always