Step by step subtract 20 from both sides and then subtract 20 from 9 to get -11 
Answer: C=-11
        
             
        
        
        
L x W = Area 
40 x 15 = 600 square ft 
So you would need 6 bags of feed
600/ 100 = 6
        
             
        
        
        
A = base side=3
b= base side=5
c = base side=3
h= height=7-4=3
l= lenght=6
w= width=5
h= height=4
V= 1/4h√(-a⁴+2(ab)²+2(ac)²-b⁴+2(bc)²-c⁴) + l w h 
V=12.44+ 120=132.44 unit³
        
             
        
        
        
Step-by-step explanation:
We have been given that David, Egil and Frances share money in the ratio 2:7:9. 
Let 2x, 7x and 9x be the amounts of money that David, Agil and Frances get respectively.  
We are told that Frances gets $80 more than David. So we can write this information in an equation as:

Now let us solve for x. 


 
Now let us substitute 
 in 7x (amount of money that Egil gets).

Upon cancelling out 7 from numerator and denominator we will get,
  
Therefore, Egil will get $80.    
 
        
             
        
        
        
Answer:
x = 
Step-by-step explanation:
4x-y+2z = 8x+y-4
4x-8x-y+2z = 8x - 8x +y-4
-4x -y +2z= y-4
-4x -y+y +2z = y+y-4
-4x +2z = 2y-4
-4x+2z-2z = 2y-2z-4
-4x = 2y-2z-4
 = 