Answer: +3
Step-by-step explanation: Before taking the absolute value of a number, always simplify what's inside the absolute value as much as possible.
So here we have -4 - (-1) inside the absolute value. Now, remember that minus a negative means the same thing as plus a positive so we can change -4 - (-1) to -4 + (+1) which is -3.
So we have the absolute value of ║-3║. Now, remember that absolute value means distance from zero on a number line so for the absolute value of -3, we know that -3 is 3 units from zero on a number line so the absolute value of -3 will simply be +3.
So the absolute value of |-4-(-1)| is +3.