Answer:
8pi
Step-by-step explanation:
 
        
             
        
        
        
Answer: 55.0% decrease
Explanation: 100% =10 
100% divided by 10 is 10%
10 divided by 10 is 1 
So 1 is 10%
1 divided by 2 = 0.5 Is 10% divided by 2 = 5%
So 4.5 is 45%
100% - 45% = 55% 
So there is a 55.0%decrease
        
             
        
        
        
Evaluations can only be done with algebraic equations 
 
        
                    
             
        
        
        
Answer:
 = 22   is the answer to the first question
 = 22   is the answer to the first question
d = 4 is the answer to the second question
Step-by-step explanation:
use the formula 
6 - 2 = 4 = d  a = -2  n = 7
 = -2 + (7 - 1)4
 = -2 + (7 - 1)4
    = -2 + 6(4)
    = -2 + 24
    = 22
use the formula 
a = 7
n = 4    

28 = 7 + (7 - 1)d
      = 4 + 6d
24 = 6d
d = 4
 
        
             
        
        
        
Step-by-step explanation:
can you add a picture of the question please ...