Answer:
x=9
Reverse. 14-5=9, so x must be 9.
 
        
                    
             
        
        
        
Its a graph linear i believe
        
             
        
        
        
Answer: y=3x+3 would be your answer 
 
        
             
        
        
        
There are 2001 items in that set. 
So n(A) = 2001
We can individually count them all out, which is very slow and tedious, or we can use the formula
n-m+1
where,
m = starting value
n = ending value
In this case,
m = 0
n = 2000
So,
n-m+1 = 2000-0+1 = 2001
This formula only works if we increase the number by 1 each time (eg: 6, 7, 8, etc)