Did I get it correct? http://prntscr.com/cl1lat

Question

ebayminer126 · Answer

@TheSmartOne  I need you to check my math. :)

thesmartone · Answer

a - (-b) = a + b

NOT
a - (-b) = a - b

Another way to look at the question is 
We want to find the distance between -2.5 and 2.5
What is the distance between -2.5 and 0?
What is the distance between 0 and 2.5?

If you add that up, you'll get the same answer as 2.5 - (-2.5)

:)

ebayminer126 · Answer

So -2.5 - 0=0 and 0-2.5=0  So did I get it? Or should I add what I just put to my answer?

ebayminer126 · Answer

@TheSmartOne

thesmartone · Answer

distance will always be positive

how many units do you move to go from 2.5 to 0 and from o to -2.5

also note that
-2.5 - 0 = -2.5
0 - 2.5 = -2.5

That 0 doesn't change anything. Only when you multiply a number by 0 will the product be 0