Final answer:
The additive inverse of -10 1/4 is 10 1/4.
Step-by-step explanation:
The additive inverse of -10 1/4 is the number that, when added to -10 1/4, gives a sum of 0. To find the additive inverse, we can simply change the sign of the number. In this case, the additive inverse of -10 1/4 is 10 1/4.