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Question:

Find the additive inverse of -9 on the 12-hour clock?

Hello,I am trying to figure this out but not successful with it, if you can help I would appreciate it thank you!

Answer:

The additive inverse is the number that makes another number equal to zero when added. For example, 4 and -4 are additive inverses because -4 + 4 = 0. On a clock, there is no zero. 12 represents zero. To find the inverse of -9 on the 12 hour clock, find the number that adds to -9 to make 12. Subtract -9 from 12 or use algebra: -9 + x = 12 x = 21 The additive inverse of -9 on a 12 hour clock is 21. Hope this helps!
Apr 13, 2017

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