Answer: the third one 
Step-by-step explanation:
 
        
             
        
        
        
Answer:
C
Step-by-step explanation:
Functions meet the vertical line test:
 a vertical line will intersect the graph at  most at one point
C doesn't pass the vertical line test and is therefor not a function
 
        
             
        
        
        
Answer: 3.6 
Step-by-step explanation:
½bh = 6.12 
½ × 3.4 × b = 6.12 
b = 6.12/ 1.7 
 
        
             
        
        
        
Answer:
-3.
Step-by-step explanation:
In the table, the y value goes down by -4 and then -2, for a total of -6.
We did this over a period of two units (To go from -1 to 1, we add 2).
-6/2 = -3.
-3 is the average rate of change over the interval.