I think that (1/4)x+8 would be your algebraic expression.  
        
             
        
        
        
Answer:
The probability of selecting a solid black marbles both times;
P = 9/100 
Attached is the completed question;
Step-by-step explanation:
Number of solid black marbles = 3
Total number of marbles = 10
The probability of selecting a solid black marble;
P1 = 3/10
With the assumption that the marbles are replaced before next selection.
The probability of selecting a solid black marbles both times;
P = P1 × P1 = 3/10 × 3/10 = 9/100
P = 9/100 
 
        
             
        
        
        
No idea sorry! If I knew I would tell you