Determine the vertex of the parabola whose Determine the vertex of the parabola whose x-intercepts are at x = 1, 9 and whose y-
intercept is at y = –13.5.
1. vertex
(3, 24)
2. vertex
(5,25)
3. vertex
(6,23)
4. vertex
(5,24)
5. vertex
(4,23)