Question

define x - intercept
where the parabola touches or intersects the y - axis
the highest or lowest point on the graph
a line that divides the graph into two equal parts. i.e. cuts the graph in half
where the parabola touches or intersects the x - axis

Explanation:

The x-intercept of a graph (including a parabola) is the point(s) where the graph crosses or touches the x-axis, which corresponds to the value(s) of x when y=0.

Answer:

Where the parabola touches or intersects the x-axis