Add.
–4.75 + 2.19
a.
–6.94
b.
–2.56
c.
2.56
d.
6.94

–4.75 + 2.19

The easiest way to do this (in my opinion) is to switch signs: 
4.75 - 2.19: 

  4.75
 -2.19
=2.56

Finally, put the - sign back to get 
-2.56

The answer is B.

9/12 is the answer because 3/4 times 3 each is 9/12