They are both an average calculation to the nearest whole number.
Answer:
37.5 
Step-by-step explanation:
As the area of each of the side of the cube are the same we can multiply the area of one side by 6.
The area of one side is

3 is the greatest common factor, because both numbers are divisible only by 3.
Answer:
8
Step-by-step explanation:
-4-(-12)
If you take away a negative that means you are adding so you do -4+12 because there is a double negative.