Polyhedron what are they

In geometry, a polyhedron is a three-dimensional shape with flat polygonal faces, straight edges and sharp corners or vertices. The word polyhedron comes from the Classical Greek πολύεδρον, as poly- + -hedron. A convex polyhedron is the convex hull of finitely many points, not all on the same plane.

A polyhedron is a 3-D shape with flat polygonal faces (think complete flat shapes with no curvatures), straight edges, and sharp vertices (corners).

step-by-step explanation:

(d)

step-by-step explanation:

given: the line in the graph passes through points (5,30) and (6,26).

then, the equation of line is:

now, put y=a(n) and x=n,

hence, option d is correct.