Answer:
140
Step-by-step explanation:
180 - 40 = 140
 
        
                    
             
        
        
        
Answer:
x= 9
Step-by-step explanation:
13x+2+3x-4+5x-7=180
21x-9=180
21x=189
x=9
 
        
             
        
        
        
Answer:
23200
Step-by-step explanation:
42 percent of 40000 is 16800
40000-16800=23200
please give me brainliest!!!<3
 
        
                    
             
        
        
        
Answer:
One triangle
Step-by-step explanation:
The angles being fixed at 30° and 60° cause the legs to be fixed. 
For the 30° angle, one side is the given side of 12, the other side is at a fixed position.
The same goes for the 60° angle.  
So both missing legs of the triangle are at fixed angles.  The missing angle is 90° (if one is 30° and the other is 60°, then the last angle must add up to 180°, so it is 90°)
Since the last angle is also fixed, it means that there is only one way for the legs to intersect to cause a 90° angle, so there is only one triangle that can be formed