Given that,
Last year record = 12
This year record = 15.
To find,
The percent increase of his Collection.
Solution,
The percent increase in his collection is given by :

So, the percent increase of his collection is 25%.
 
        
             
        
        
        
<span>12*(4x−5)/52=10 if this is the equation
the value for x would be
x </span>≈ 12
        
             
        
        
        
Answer:16
Step-by-step explanation:The lines that are outside of the numbers keep the numbers positive so if you change them to positive number (15+1) you can add them and it gives you 16