Question

vertex: ( , )

Explanation:

Step1: Locate the highest point

The vertex of a parabola (the shape shown in the graph) is the highest or lowest point. In this upward - opening parabola, point D is the highest point.

Step2: Read the coordinates

By looking at the grid, we can see that the x - coordinate of point D is 4 and the y - coordinate is 16.

Answer:

(4, 16)