Part A
To solve the equation \(3,500 + \text{Choose} = 3,500\):
We need to determine what number can be added to 3,500 to still get 3,500. The only number that satisfies this condition is 0.
So, the answer is: 0
Part B
The equation \(3,500 + 0 = 3,500\) demonstrates which property of addition?
The property illustrated here is the Identity Property of Addition. This property states that when you add zero to any number, the result is the original number.
So, the answer is: Identity Property of Addition