find the additive inverse of -9 on the 12-hour clock
That would be 9. The additative inverse of 9 is minus 9 and that is equivalent to -9 + 12 = 3
To find the additive inverse of -9 on the 12-hour clock, we need to subtract -9 from 12 because the additive inverse is the number that, when added to the given number, produces zero.
Step 1: Subtract -9 from 12.
12 - (-9) = 12 + 9 = 21
Therefore, the additive inverse of -9 on the 12-hour clock is 21.