16 is the answer. I think
        
             
        
        
        
Sorry what is the question I cannot see the question
        
             
        
        
        
Stem|leaf data: 11 12 13 21 22 23
 1|1 2 3
 2| 1 2 3
You're basically just splitting the numbers up. Tens in the stem row and ones in the leaf row. I hope this helps you!
        
             
        
        
        
Answer:
10x² - 14xy -6y
Step-by-step explanation:
5x(2x-y)-3y(2+3x)
10x²-5xy-6y-9xy
10x² - 14xy - 6y