Answer:
16 rooms
Step-by-step explanation:
 
        
             
        
        
        
I believe x=3. 
4x-3(-2)=18
4x=12
x=3
        
             
        
        
        
You need to write it out such as number 8 would be 10x10x10x10 so for every number on top you multiply the number by itself
        
             
        
        
        
Answer:
charge for d days=d×75$
charge for k kilometers=k×65cents
total cost=75d$+k×0.65$
c=(75d+0.65k)$