Which is an arithmetic sequence?A)9, 12, 16, 20...B)9, 11, 13, 16...C)1, 5, 9, 13, 17...D)12, 14, 16, 18... 
                marta [7]             
         
        
Answer: https://www.khanacademy.org/commoncore/grade-HSF-F-IF#HSF-IF.A.3
Step-by-step explanation:
copy and paste the link on to your search bar
 
        
             
        
        
        
B) 35
the formula is .5(outer angle - inner angle) = .5(100-30)=.5*70=35
        
                    
             
        
        
        
Answer
No. The amounts of change are the same, but the original amounts are different. The ratio for the percent increase from 50 to 70 is 20/50, or 40%. The ratio for the percent decrease from 70 to 50 is 20/70, or about 29%.
 
        
                    
             
        
        
        
Answer:428.67
Step-by-step explanation:
πr (r+square root(h2+r2) plug in the numbers
 
        
             
        
        
        
Answer:
-16s+40
Step-by-step explanation: