Answer:
d
Explanation:
when you chop a recipe like that you have to divide all the measurements by the same number you reduced the product number of.
 
        
                    
             
        
        
        
What do u mean? 
if you mean book recommendations here you go:
- Red queen
- Two can keep a secret
- We were liars 
- One of us in lying 
These are some of my favs <3
 
        
                    
             
        
        
        
Lowest number is 1 highest number is 9 so 9-1= 8. range is d. 8
        
             
        
        
        
The answer to the first question:
"What are some of the best places to find art references?"
I've been drawing for a while, and I find that good references depend on what you're drawing, but if you like to draw people, like I do, I find references for people on Pinterest for one, but I also use real people as references (especially using my siblings :) ) 
A good way is to see how people work and practice anatomy and proportions, trust me, they are a BIG part of drawing, especially people!!
Hope this helped!! \(^u^\)
P.S. sorry I don't really paint, (cuz I'm bad at it) so I can't really answer that question (^w^')