Astone arch in a bridge forms a parabola described by the equation y = a(x-h)2 + k, where y is the height in feet of the arch above the water, x is the horizontal distance from the left end of the arch, a is a constant, and (h, k) is the vertex of the parabola.
what is the equation that describes the parabola formed by the arch?
y = -0.090(x-13)2 + 12
y = -0.090(x-12)2 + 13
y = -0.071(×-13)2 + 12
y =-0.071(×-13)2+ 13