Answer:
 where
 where  is the amount of banners sold.
 is the amount of banners sold.
Step-by-step explanation:
We know the team has already spent $40, and they earn #3.5 per banner.
Hence, with  representing the amount of banners sold, the equation is
 representing the amount of banners sold, the equation is 
 
        
             
        
        
        
Answer:
390cm
Step-by-step explanation:
1. find area of rectangle
  1. 15cm x 20cm= 300 cm
2. find area of triangle
   1. 1/2 (12 x 15)= 90cm
300+90
 
        
             
        
        
        
The cost of one slice of mushroom pizza is $2.00 dollars. This is solved by subtracting the equations:  
X = cheese pizza 
Y = mushroom pizza  
(3X + 4Y = 12.50) 
- (3X + 2Y = 8.50)
 ______________ 
2Y = 4.00 
Y=2 or a slice of mushroom pizza is $2.00.