Question

if -3 and 5 are the coordinates of two points on a real number line, the distance between these two points is

Answer 1

There is no negative when we r talking about distance 
so, 
distance between -3 and 5 in a real number line will be |-3+0|+|0+5|=|3+5|=|8| or 8 where 8 can never be negative