Equilateral- all sides are the same
In each row, the 15 number of the student is arranged. For the given condition, the equal number of the student is to be arranged.
<h3>What is seating arrangement?</h3>
A seating arrangement is an arrangement shows that how the peoples are arranged so that the complete utilization is done.
The given data in the problem is;
The total no of student is 345 students
If the same number of the students are to be arranged for the given row, the following calculation is done;
The numbers of the student in each row is found as;

Hence, in each row, the 15 no of the student is arranged.
To learn more about the seating arrangement, refer to the link;
brainly.com/question/13492666
#SPJ1
Answer:
its either 6 or negative 9 there is no x in the equation
however its most likely -9
Step-by-step explanation:
Step-by-step explanation:
8x + x² - 2y + y² - 64 = 0
(x + 4)² + (y - 1)² - 81 = 0
(x + 4)² + (y - 1)² = 81
Hencr the center is (-4,1) and the radius is 9.