Solve the problem.
A building has an entry the shape of a parabolic arch 42 ft high and 40 ft wide at the base. Find an equation for the parabola if the vertex is put at the origin of the coordinate system.
A. y2 = -9.5x
B. y2 = -38.1x
C. x2 = -9.5y
D. x2 = -38.1y
Answer: C
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