The first four terms of a sequence are shown on the graph below.

On a coordinate plane, points are at (1, negative 3), (2, 3), (3, negative 3), (4, 3).

What can be concluded about the sequence?
The common ratio of the sequence is 3.
The common ratio of the sequence is –1.
The common difference of the sequence is 6.
The common difference of the sequence is –6.

First locate the turning point (vertex) of the graph. which is at the coordinates x=5 and y=9 or (5; 9).to determine whether it's a maximum or mininum value, you have to discern whether the vertex's y-value is the highest value or lowest value the graph can reach. since the vertex's y-value, 9 is the highest value the graph can reach, it will be a maximum.another basic way to determine whether the vertex's value is max or min is to see if the graph is smiling or sad. if it's smiling, the turning point/vertex would be a minimum, while a sad parabola would have a maximum y-value at the vertex.