Assuming that the missing operations are multiplication as it is with the first question "bd", then the answer would be as follows:
1.) Simply substitute the values of b and d before multiplying.
bd = (-2)(-6) = 12
2.) (-50)(-2) = 100
3.) (5/8)(7/12)= 35/96
12.

The answer would most likely be 5.11 or 11.5
Perimeter is , or around 63.89 in.
If you meant that the area was 225 in²:
Perimeter is 60 in
Answer:
the answer is a where x=8
Explanation:
cross multiplication method