#1**-2 **

it means I pressume half of the subtracted answer because the word diffrence is represented as the answer of two or more subtracted numbers.

HiylinLink Feb 20, 2019

#3**+1 **

(x-y)/2 would be half the difference between x and y

half the difference between 9 and 3 would be (9-3)/2 = 3

ElectricPavlov Feb 20, 2019