Answer
5/2
Work Step by Step
To find the absolute value of a given expression we need to define what is the absolute value function. The absolute value of a number is its distance from the origin.
|x| = 0 if x = 0;
|x| = -x if x < 0;
|x| = x if x > 0;
a = -5/2, b = 0
|a-b| = |-5/2 - 0| = |-5/2| = -(-5/2) as -5/2 < 0
Hence |a-b| = 5/2
