The quotient of 8 and h is written as 8/h
So since, they are the same distance from zero, they should be the oppposite of each other so in other words, k=-h and h=-k
so k+h=(subisute)k-k=-h+h=0 because they cancel
Simplify the experssion and you get 10.
Hope this helps!
I believe it's it's d
Sorry if I'm wrong I'm mr lemonade