Question

vertex: ( )

Explanation:

Step1: Locate highest point

The vertex of a parabola is the highest or lowest point. In this graph, point D is the highest point.

Step2: Determine x - coordinate

Count the number of units from the y - axis to point D. It is 4 units to the right of the y - axis, so the x - coordinate is 4.

Step3: Determine y - coordinate

Count the number of units from the x - axis to point D. It is 16 units above the x - axis, so the y - coordinate is 16.

Answer:

(4, 16)