Answer:
see explanation
Explanation:
(a) No
12.75 + 12.75 = 25.5 ≠ 0
(b) No
 = 0.5 and 
0.5 + 0.5 = 1 ≠ 0
(c) Yes
The absolute value always gives a positive value , so
| - 
 | = 
 , and
 - 
 = 0
(2)
note + (- ) is equivalent to - , that is subtraction
- 13 + (- 5) = - 13 - 5 = - 18