The sum of a number and its additive inverse is 0.
-3.5
Practice makes perfect
The sum of a number and its additive inverse is 0. We can find the additive inverse by changing the sign of the given number.
a + ( - a)=0
We can follow this line of thinking with the given number.
3.5 + ( -3.5)=0
The additive inverse of 3.5 is -3.5.