the third fifth and first
        
             
        
        
        
The correct answer is D.
A function cannot have an x-value that corresponds to more than one y-value.
In this table, the x-value '8' corresponds to two separate y-values; 8 and 5, making it invalid as a function.
        
             
        
        
        
Answer:
1.A,B,C,D
2. AB, CD 
3. AC, BD 
4. Line AD (don't take my word for this one)
Step-by-step explanation:
 
        
             
        
        
        
The answer is 125 messages.
Firstly the best thing to do is create two different equations.
1. y=25+.08x
2. y=20+.12x
Then you plug into Desmos and see at what point they cross. They cross at (125, 35).
Therefore for 125 text messages would cost 35$ for each plan.