The function h(x) = 9 is a horizontal line at the height of 9 on the y-axis.
Since it is a horizontal line, it does not have any vertical asymptotes.
However, it does have a horizontal asymptote, which is the horizontal line y = 9 itself. As x approaches infinity or negative infinity, the function approaches the constant value of 9, and the horizontal line y = 9 acts as an asymptote for the function.