Difficult to tell when you cannot use parentheses.
a*(b+c) or a(b+c) = ab + ac
This is known as the distributive property of multiplication over addition.
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associative property
between A and B
There are some missing terms. First of all, I assume that A, B, and C are collinear and that B is between A and C.If this is true then AC-AB=BC by the whole is the sum of its parts theorem.24-20=4Otherwise, all that can be said about BC is that it's length is between AC-AB = 4 and AC+AB = 44 units.
If 2 segments have the same length they are known as 'congruent segments' IE: segment AB=segment AC (or AB=AC) then AB @ AC (or AB is congruent to AC)
(a + b)(b + c)