Answer:
1.18b 
Step-by-step explanation:
Jacob had lunch at a restaurant and his bill was b.
Now, Jacob leaves 18% of his bill amount as a tip.
So, the tip amount at the rate of 18% of the bill amount will be  
Therefore, the total cost of Jacob for the lunch will be b + 0.18b = 1.18b. (Answer)
 
        
             
        
        
        
I'm guessing it is 18. 18 decreased by nine equals nine so to me it makes sense.
        
                    
             
        
        
        
10/1 = 43.5/x 
cross multiply
10x=43.5
divide by 10 on each side
x = 4.35
it will take 4.35 minutes
        
             
        
        
        
Answer:
I think it might be 6 
Step-by-step explanation:
You should probably wait for another answer, I did this in Math last year so I think it's 6 but I can't really remember sorry ):