So, I assume that you mean 26 students times the teachers.
You can create two equations out of this information.
s = students while t = teachers
26t = s
900 - 9 = 891 seats being occupied
s + t = 891
You can use these two equations for substitution.
s = 891 - t
26t = 891 - t
27t = 891
t = 31
So, 31 teachers. Now plug that back into an original equation.
s + (31) = 891
s = 860
860 students.
6*40=240. 4*40=160. 240*160=38400. 38400 is your answer.
Perimiter=2(L+W)
P=2(100+120)
P=2(220)
P=440
0.1 per foot
440*0.10=44
$44
3(x-5), using the distributive property, we get 3x - 15
A= -3 should be the answer
