Answer:
20%
Step-by-step explanation:
 
        
                    
             
        
        
        
That would not be right because 4 times 3 equals 12 and -6 times 3 equals -18.
        
             
        
        
        
Answer:
do u still need help. I can help 
 
        
             
        
        
        
One way it's useful is in the application of phasors in physics. Phasors require you to add up vectors of two different angles, so the cosine angle addition formula can be used if you already know the cosine and sine of the original vector angles.
        
                    
             
        
        
        
Answer:
6 units
Step-by-step explanation:
This is an isosceles triangle.  Thus, the side marked 'x' has the same length as the other leg (the horizontal leg):  6 units.