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Mathematics 8 Online
OpenStudy (anonymous):

evaluate 9-(-12)

OpenStudy (anonymous):

21

OpenStudy (anonymous):

You simplify it to 9+12 and you get 21

OpenStudy (anonymous):

21

OpenStudy (anonymous):

your right @cloudz

TheSmartOne (thesmartone):

@paml welcome to Open Study! 9-(-12)=9+12=21 when ever you subtract from a negative number it becomes addition. For example: 5-(-4) It will become addition so 5+4 which equals 9.

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