Answer:
-16
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
60a - 72ab
Step-by-step explanation:
B and C do not work because there is no "c" in the expression
-3(-4a[0-6b+5])
-3(-4a[5-6b])
-3(-20a+24ab)
60a - 72ab
None of the given choices are correct.
 
        
             
        
        
        
Answer:
A= 27500 seats, B= 14200 seats, C= 13300 seats
Step-by-step explanation:
a=b+c
a+b+c=55000 seats
30a+24b+18c=1405200 dollars
substitue a for b+c
b+c+b+c=55000
30(b+c)+24b+18c=1405200
seats 2b+2c=55000 --> divide by 2 on both sides b+c=27500 --> c=27500-b
dollars 30b+30c+24b+18c=1405200 --> 54b+48c=1405200 divide by 6 --> 9b+8c=234200
substitute c for 13750-b
9b+8(27500-b)=234200
9b+220000-8b=234,200
b=14,200 seats
c=27500-b=27500-14200=13300 seats
a=55000-b-c=55000-27500=27500 seats
 
        
                    
             
        
        
        
B. -7
The answer all comes down to you getting -7/f. 
Hope I helped!