Charla wants to determine the vertex of the function f(x) = x2 – 18x + 60 by changing the function into vertex form. which statement about the vertex of the function is true?

the x-coordinate of the vertex is greater than the y-coordinate.

the x-coordinate of the vertex is negative.

the y-coordinate of the vertex is greater than the y-intercept.

the y-coordinate of the vertex is positive