Answer:
Step-by-step explanation:
Hope it helped u
 
        
             
        
        
        
Answer:
45
Step-by-step explanation:
The absolute value of negative 5 is 5 because it is five units away from zero, and then 9x5=45. 
 
        
             
        
        
        
Make variables for each
L = library books
P = telephone books
T = text books
so.... L+P = 2T 
now we have to fill in numbers