12÷4=3 and 36÷12=3
so the ratio is same 
therefore it is a geometry sequence


=108
 
        
             
        
        
        
Answer: approximately normal
Step-by-step explanation:
 
        
             
        
        
        
Answer:
number 3
Step-by-step explanation:
 
        
                    
             
        
        
        
The closest would be 7
7x7 is 49 and that is the closest
        
                    
             
        
        
        
A+30 = 60
a = 30
a + 2b = 60
30+2b = 60
2b = 30
b = 15
5b - 5c = 60
5(15) - 5c = 60
5c = 15
c = 3
10c + d = 60
10(3) + d = 60
30 + d = 60
d = 30
2d + 6e = 180 - 60
2(30) + 6e = 120
6e = 60
e = 10
4f + 4e = 120
4f + 4(10) = 120
4f = 80
f = 20