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
<u>the answer Part a) and part b) in the attached figure</u>
Answer:

Step-by-step explanation:




<h3>Hope it is helpful...</h3>
Since y=-3 you need to set up the equation
-20-(-3)
And all you have to do is simplify
So your answer will be
-17
Hope this helped :)
Have a great day
Total distance = 1.6 miles
Madison has already hiked 0.4 miles
Miles left = 1.6 - 0.4 = 1.2 miles left