Answer:
5
Step-by-step explanation:
because ?*9=45
45÷9=5
 
        
                    
             
        
        
        
It depends on the side lengths, but the sum of all the angles is 360°
        
                    
             
        
        
        
Answer:
7/1 - 7/1 + 17/1 = 17
Step-by-step explanation:
 
        
             
        
        
        
10y - 5x = 40   Add 5x to both sides
       10y = 5x + 40   Divide both sides by 10
          y = 

x + 4
The 
y-intercept is 4 and the 
slope of the line is 
.
You can find these by comparing your equation to the equation y = mx + b, where m is the slope of the line and b is the y-intercept.