If x, y, and z represent the number of faces, edges, and vertices of a hexagonal pyramid respectively, then the value of (x + y + z2)2 is:

If x, y, and z are respectively the number of faces, vertices, and edges of a pentagonal pyramid, then the value of x + 3y - 2z is:

If F, V, and E are respectively the number of faces, vertices, and edges of a hexagonal pyramid, then which of the following statements is true?