3n = 1/81; divide both sides by 3 to isolate n:
3n/3 = 1/81 divided by 3. Remember that when you divide, you use the reciprocal and multiply instead!!
n = 1/81(1/3) = 1/243. Now plug 1/243 back in for n, and 3/243 is equivalent to 1/81
 
        
             
        
        
        
Answer:
21C
22D
23B
24C
25A 
Step-by-step explanation:
 
        
                    
             
        
        
        
I’m pretty sure it has potential energy. Because a charge battery can be charged. So it can have energy
        
             
        
        
        
Answer:
Step-by-step explanation:
 
        
             
        
        
        
Negative 3.14 
Times that by Pi which is 3.14 and then multiply by the base number and you will get the correct answer