A Building Has an Entry with the Shape of a Parabolic

Multiple Choice

A building has an entry with the shape of a parabolic arch 24 feet high and 4 feet wide at the base. Find an equation for the parabola if the vertex is placed at the origin of the coordinate system.

A) $y ^ { 2 } = - 0.2 x$
B) $y ^ { 2 } = - 0.7 x$
C) $x ^ { 2 } = - 0.2 y$
D) $x ^ { 2 } = - 0.7 y$