Only had time to do 1A 1B and half of 1C which are just algebra, but I guess it might help if you actually needed those parts.
(x-4) (x+2) (x+2) (x-2)
X intercepts = 4, -2, -2, 2.... Whatever makes the stuff in the parenthesis = 0. The two -2 mean that the graph touches the x axis but does not cross. All the other intercepts cross.
To solve for y intercept, set x = 0.
(0-4)(0+2) (0+2) (0-2)=y
y intercept =32
C. End behavior. Remember that a X^2, X^4, X^(even) will always have both ends pointing up. -X^2, -X^4, etc, will have both pointing down
X^1, X^3, X^5, X^7 etc, (x^odd) will have left side pointng down right pnting up.
-x^odd will be left up right down.
Yours will be x^4 something, so both sides should point up.