Answer:
5 i think. im not good at math. sorry if wrong
 
        
                    
             
        
        
        
Draw 27 circles and take off 4.5 circles for every hour. The answer will be 6 hrs. 
Expression:
-27/-4.5 I believe
 
        
             
        
        
        
Answer:
139968
Step-by-step explanation:
Multiply the all of the numbers together and you have your answer (:
 
        
             
        
        
        
Answer:
Please find attached the graph of the following function; 

Step-by-step explanation:
We note that the function is linear from x = 2 to just before x = 0
The linear relationship of the function f(x) with x changes just before x = 0
At x = 0, the value of f(x) is indicated as 1
From just after x = 0, the function is a straight horizontal line y = 3
The function also changes value immediately after x = 0 to the line y = 3
The areas where the function is defined are shown in continuous lines