-48a÷ 8 can be written as,

Put a=1 in the above exprression and solve.

Therefore, the solution is -6.
The answer would most commonly be C only because a square is 360 degrees and the surface area would be a 6th of that which is 60 then i multiplied it by 4 because of the four corners signaling the height and or length of the 2D figure square which gives me C.
-8, 3 Do you need me to explain
The domain is the range of the x-axis. In this situation the x range from 0 to 11, so the domain is D.