The number of seats in the theater's rows represent an ARITHMETIC SEQUENCE. In an arithmetic sequence, the next term in the sequence is found by adding a constant (a set amount), called the common difference.

For the theater, there are...
17 seats in row 1
20 seats in row 2
23 seats in row 3
26 seats in row 4

How many seats are there in row 15?
How do you know?

It is b hope this helps

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.