with the vertex at V(k, h)
2. You already know that the latus rectum l = 4p which is 6 in your question.
3. You know the x-coordiante of the vertex (k = 2) and you know the coordinates of one point of the parabola. Plug in all known values:
Solve for h.
EDIT: There are two parabolas which satisfy the given conditions!