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Mathematics 21 Online
OpenStudy (anonymous):

evaluate |-15|

OpenStudy (kainui):

All those bars mean is take the absolute value. Absolute value just means make the number positive. So if you have |3| then since it's already positive, making it positive does nothing and you get 3.

OpenStudy (anonymous):

its just the positive of the number between the bars so |-15|=15

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