Respuesta :
we know that
If two numbers have a sum of zero, then we say they are additive inverses.
so
z+0.8=0 -------> the sum is equal to zero
z=-0.8------> the additive inverse of z is equal to -0.8
using a graph tool
see the attached figure
the answer Part a) and part b) in the attached figure

Answer:
I have done this before.
The answer is Z is on -0.8
and sum is on 0
Comment and Give crowns!
Step-by-step explanation:
Hope i helped!
Have a great day!
-Your helper