No. 4^2 + 8^2 or 16 + 64 is 80, and the hypotenuse, 12 (144) is not 80.
        
             
        
        
        
If you add them together you will get 11g
        
                    
             
        
        
        
It's a linear function. The graph is a straight line, therefore we need only two points.
Select any value of x and calculate the value of y:
y = -3x + 4
for x = 0 → y = -3(0) + 4 = 4 → (0, 4)
for x = 2 → y = -3(2) + 4 = -2 → (2, -2)
 
        
             
        
        
        
For this case we have the following quadratic functions:
 Revenue: 
 Cost: 
 Then, we observe that the profit is given by the following mathematical relationship:
 
 Substituting values we have:

 Making the corresponding calculations we have:
 
 Answer:
 An expression that represents the profit is:
 