I dont know exactly how to answer this but I know that the formula for volume is S+S+S+S=V. So hope that helps!
4 tables = 1 group. So in 10 groups of tables, there are 40 tables. Each table seats 8 students, so you multiply 8 by 40, and that leaves your answer as 320 students. :)
X=-8 is the answer so it would be C
