Answer:
I would say A 
Step-by-step explanation:
 
        
             
        
        
        
Answer:
64.5%
Step-by-step explanation:
Initial amount N° = ?
Remaining amount after decay = N = ?
k = decay constant =  0.00012 
t = time = 3650 year 
fraction remaining will be N/N°
From the decay equation, N = N°
N/N° = 
N/N° = 
N/N° = 
N/N° = 0.645 = 64.5%
 
        
             
        
        
        
P = 2(L)  +2(W)
P = 2(4x+3) + 2(2x)
answer
B. 2(4x+3) + 2(2x)