The vertex of this parabola is at (4, -3). which of the following could be its equation?

One way to write the equation for the parabola is into the vertex form: x = a(y - k)² + h, where the parabola changes direction at (h,k), the x and y coordinates of the vertex. Since the vertex of the given parabola is at (4, -3), we can therefore write its equation as x = (y+3)² + 4.

Qand k are only the same when the forward rate of the reaction has reached zero.