Vertex (0,0) directrix x=-6
A)x=-1/24y^2
B)x=1/16y^2
C)x=-1/16y^2
D)x=1/24y^2

go on the tube you might find some information there

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.

the height of the surface increases from the center out to the sides of the road

it is c!