I think you wrote that incorrectly
        
             
        
        
        
It can't be simplified, it is already in its lowest term
        
                    
             
        
        
        
The rule for quotients of similar bases with different exponents is:
(a^c)/(a^b)=a^(c-b)  in this case:
15^18/(15^3)=15^15
        
             
        
        
        
Answer:
200
Step-by-step explanation: