C. The Tetrahhedron has 4 faces, all of which are triangles. It also has four vertices and six edges.
12 would be the only zero if you meant to write the equation as y=(x-12)(3-10)
(8)(-4.5) is not equivalent because 8 times -4.5 results in negative value
If you are solving for x than the answer would be x=4.
