Great Question!
The last year part is extra information. 1200÷12 (months in a year)= 100
He will have to wash 100 cars each month.
 
        
             
        
        
        
Answer:
Step-by-step explanation:
What do you man what expressions or just expressions in general.
 
        
             
        
        
        
Answer:
4u+3
Step-by-step explanation:  8/1*1/2= 8/2=4u 
                                               8/1*3/4= 24/8=3    
 
        
             
        
        
        
I hope this helps 
A.1,512
        
             
        
        
        
Let's call he width of the notebook w and the length l
w*l=80
2(w+l)=36
w+l=18
w=18-l
(18-l)*l=80
-l^2+18*l-80=0
l=8 or 10
Therefore, the notebook is 8 by 10 inches