I believe its 80 if you derive it out, but there is no units of measurement.
        
             
        
        
        
Answer:
Its A.
Step-by-step explanation:
remember its rectangle 1 + rectange 2.Once i did that i have seen the total volume must be greater then answer B
so it must be a
 
        
             
        
        
        
Answer:
4)x= g-c
5)x =u+k
6)x = g-c
7)
8)
9)
10)
11)
12)
13)a= d -r + c
14)
Step-by-step explanation:
4) g= c+x
x= g-c
5) u=x-k
x =u+k
6)g = c+x 
x = g-c
7) 
8) g=xc

9) 12am = 4

10)-3x+2c = -3
2c = -3 +3x
2c +3 = 3x

11) am= n+p

12)
13)a-c = d-r
a= d -r + c
14)xm= np

 
        
             
        
        
        
Answer:
I had 18 cookies and I ate them all. 
Step-by-step explanation:
This situation is represented by zero because 18-18 is 0.