We know all the side lengths so can use law of cosines. a=90, b=55, and c=50. 
2500=8100+3025-2(90)(55)cos(C)
cos(C)=.8712
C=arccos(.8712)=29.4 degrees
        
                    
             
        
        
        
Answer:
2
Step-by-step explanation:
 
        
             
        
        
        
Answer:
46/117
Step-by-step explanation:
 
        
                    
             
        
        
        
Combine like terms
2n^6 - 24n^5 + 64n^5
2n^6 + 40n^5
factor out 2n^5
2n^5 (n + 20)
answer: 2n^5 (n + 20)