Remark
I do know why you are confused. It is hard to wrap one's head around something like this when you see it for the first time.
A
Because the graph is vertical, the x values are the same. x1 = x2
B
The segment can be represented as AB = |y2 - y1| You are not sure which is bigger. That is why you use the absolute value form.
C
AB = absolute(y1 - y2) The absolute value will make AB positive no matter which way it is written.
D
The answer to D is in parts B and C. You want AB to have a positive value no matter how y1 and y2 are chosen
E
No and the reason is found in D.
F
GH = abs(y2 - y1)
y2 = 2
y1 = - 32
GH = abs(2 - - 32) = (2 + 32) = 34
Or
GH = abs(-32 - 2) = abs(-34) = 34
