Which of these is the standard form of a vertical parabola with vertex (h,k)(h, k)(h,k)?
x=a(y−k)2+hx = a(y-k)^2 + hx=a(y−k)2+h
y=a(x−h)2+ky = a(x-h)^2 + ky=a(x−h)2+k
y=a(x−k)2+hy = a(x-k)^2 + hy=a(x−k)2+h
x=a(y−h)2+kx = a(y-h)^2 + kx=a(y−h)2+k