Answer:
15 books 
Step-by-step explanation:
we can find this by multiply 3 x 5 which gets us our answer 15
 
        
                    
             
        
        
        
Mono means one..but monomial can also a negative. Mono meaning one means there is a single variable. 
        
             
        
        
        
Its super easy all u have to do is go on tiger math and the first link will take you to it and u put in the question and it will give you a step by step how to do it and it will give you the answer 
 
        
             
        
        
        
Standard form: 2x - 16 = 0
Factorization: 2(x - 8) = 0
Solutions: x = 16/2 = 8
Hope this helps!