Answer:
7 paperbacks, 2 hardcovers 
Step-by-step explanation:
2x8=16
7x5=35
35+16=51
Hope this answers your question.
 
        
                    
             
        
        
        
I have no idea about the part A, but part b, all you have to do is get all the numbers of the fans, and put them in least to greatest. Then you count how fans are from 0-9, then you count how much fans are from 10 - 19, and so on. Im sorry that i couldn't answer it completely but i hope this helps.
 
        
                    
             
        
        
        
Answer:
The answer to your question is the third option
Step-by-step explanation:
a) This first option is not correct because if a number is less or equal to zero does not affect in if it is a function or not.
b) It option is incorrect because each value of x has two values or y and the defition of function says that x must have only one y value.
c) This is the definition of function, it's correct
d) This option is wrong, is similar to the first option.
 
        
             
        
        
        
R=15
explain:
add the numbers in parentheses to get 
45/3 = r
divide the numbers to get
15 = r
        
                    
             
        
        
        
1,5 one and a half cups of blueberry jam