I think it D cause 30(cos(30x)+14=-16 
Your dividing by 30 
your 180 (which is degrees) is 
 radians. As the cosine function is periodic with period 2 we get
        
                    
             
        
        
        
Answer:
(1, -6)
Step-by-step explanation:
the layout of your question is kind of confusing, but i'm guessing this is the system of equations
x = -y - 5
-3x + 7y = -45
plug in x to the second equation
-3(-y - 5) + 7y = -45
distribute
3y + 15 + 7y = -45
combine like terms
10y = - 60
divide by 10
y = -6
plug y into first equation
x = -(-6) - 5
x = 6 - 5
x = 1
 
        
             
        
        
        
Answer:
r⁶
Step-by-step explanation:
Cancel the common factors or r⁹ and r³ 
 
        
                    
             
        
        
        
6 packs of 3
2 packs of 9
3 packs of 3, 1 pack of 9 
answer: 3 ways