I think this is the answer
 
        
        
        
Answer:
B. 5/6
Answer explained: 
Prime numbers include 2, 3, and 5 and all numbers after 3 are 4, 5, 6 so 5 out of 6 or 5/6
        
             
        
        
        
Let 'c' represent the number of points Carlos scored.
2c - 7 = 31
c = 19 points
        
             
        
        
        
Answer:
x + 15
Step-by-step explanation:
Since I don't know what this number is, I'm going to use the variable x to substitute for the value of the unknown number.
So it would just be x + 15 because addition is the operation of adding and the key words are usually more. Since one of the numbers is unknown, we can't get an answer like "100" because x is undefined. 
Say x=100, then the number would be written as 115 in it's simplest form but you could also write it as 100+15. So I'm just using substitution.
 
        
                    
             
        
        
        
Answer:
Have you got the answer yet?
Step-by-step explanation: