# math

for each mathematical statement below determine if it's always, sometimes, or never true.

a. |m-n| = |m| - |n|
b. b + (-b) = 0

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1. |6-4| = |6|-|4| = 6-4 = 2
|4-6| ≠ |4|-|6| = 4-6 = -2

-b is the additive inverse of b, so the statement is always true.

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posted by Steve
2. thanks

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posted by teaopi

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