Phillip adds a number to its opposite number. what is the sum of these numbers?
a. a positive number
b. a negative number
c.0
d. a positive or negative number, depending on the numbers used

Option C) 0

Step-by-step explanation:

we know that

The opposite of a number is equal to the same number but with a different sign

The sum of a number with its opposite number is always equal to zero

Let

x > a number

The opposite of the number is equal to -x

Adds the number and its opposite

x+(-x)=0

therefore

The sum of these two numbers is zero