Answer:
Additive Identity
Step-by-step explanation:
Given number: 17985
Let say June added x to this no.
The result of the addition = 17985
Result = 17985 + x
17985 = 17985 + x
Thus, x = 0.
This means that June added "0" (zero) to the number. This is additive identity. As per this property, when additive identity is added to a number, the number remains unchanged.