X1+X2 Y1+Y2
--------- , ---------
2 2
Thats the equation. You write that (the equation above) in parentheses.
8.87 x 10^10 is the scientific notation
The x values are the domain and they y values are the range. So the domain is {-2, 0, 2}. And the range is {-1, 0, 1}. So B is the answer.
9/56 is already in its simplest form. You CANNOT make it more reduced than this