When we have consecutive values, f(10), f(11), f(12), f(13), f(14), we can make a difference table to determine the degree of f as a polynomial.  A quadratic will have a constant second difference:
x         10  11    12    13   14
f(x)       50 71  94  119  146
1st diff    21   23  25  27
2nd diff      2    2    2
We got a constant second difference, so f is a polynomial of degree two. 
Answer: This function is quadratic
 
        
             
        
        
        
Answer:
(8, 5, -4, 4)
Step-by-step explanation:
The domain is basically the input or x coordinate. The x coordinates of the points are 8, 5, -4, and 4. Therefore, the domain is 8, 5, -4, and 4.
 
        
             
        
        
        
Answer:we cant see the drop down menu so we cant answer the question! 
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Step-by-step explanation:
3rd one
 
        
             
        
        
        
Answer:
When the solution is negative
Step-by-step explanation:
One example, let's say you are buying pens and each pen cost 3 dollars and you cannot spend more than 15 dollars, how many pens can you buy? 
The inequality would be 3x < 15, so any negative solution is not reasonable because you cannot buy negative pens. The same goes for most real-world problems dealing with time, money, or distance.