There is two hundred and four (204) on a standard chessboard.
C and D because in that image that is what an proportional relationship looks like so anything that looks like the graph in the photo or c and d is proportional
Y = -x +8 is the answer for this one.
3x (4x^4-5x)
add all of the numbers with a x to get
12x^4
and 12x^4=
20736x