Answer:
Can I please have more details on what your question is? 
Step-by-step explanation:
 
        
             
        
        
        
Angle four is 30° and angle 7 is 150! angle four equals 30° because a straight line equals 180, and 180-150=30. angle 7 is 150 through corresponding angles
        
             
        
        
        
Answer:
0
Step-by-step explanation:
x=1 and y=-3 
so 3x^2 + y = 3*1^2 + (-3)
= 3* 1 -3
=0
 
        
             
        
        
        
Answer:
r < -12 and r > -6
Step-by-step explanation: