Answer:
Step-by-step explanation:
tn = a + (n-1)*d
t28 = 4 +   (27)*-2     27 because 27 = 28 - 1
t28  = 4 + - 54
t28 = 4 - 54
t28 = - 50      
 
        
             
        
        
        
Answer:
56.55
Step-by-step explanation:
C=2πr=2·π·9≈56.54867
 
        
                    
             
        
        
        
Answer:
simple 11
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
21/20
Step-by-step explanation:
 
        
             
        
        
        
Answer:
7−2x
Step-by-step explanation:
1 Collect like terms.
(4+3)+(-7x+5x)
(4+3)+(−7x+5x)
2 Simplify.
7-2x
7−2x