Final answer:
The additive inverse of -10 1/4 is 10 1/4.
Step-by-step explanation:
The additive inverse of a number is the number that, when added to the original number, gives a sum of zero.
To find the additive inverse of -10 1/4, we need to find the number that, when added to -10 1/4, will give a sum of zero.
The additive inverse of -10 1/4 is 10 1/4, which is option A.