What is the sum of a number and its additive inverse?
a. 0
b. -1
c. 1
d. undefined

The sum of a number and its additive inverse is  0

Step-by-step explanation:

The additive inverse of a number is what you add to a number to create the sum of zero. So in other words, the additive inverse of x is another number, y, as long as the sum of x + y equals zero. The additive inverse of x is equal and opposite in sign to it (so, y = -x or vice versa).

The additive inverse of a is denoted by unary minus: −a

For real number, it reverses its sign, the opposite to a positive number is negative, and the opposite to a negative number is positive.

Zero is the additive inverse of itself.

For Example

Let us consider a number 7 .

Its additive inverse is  -7

So the sum of the number and its additive inverse is

=> 7 +( -7)

=> 7 -7

=> 0

the answer is b