Book. His initial costs are $864. Binding and packing each book cost $.80 The price of the book is $2.How many copies must be sold to break-even 
y=0.8x+864 
y=2x 
Answer: 720 books
        
                    
             
        
        
        
Answer: 5
Step-by-step explanation:
20/4=5 which is 20%
5*5=25 which is the number
20% of the number is 
100/20=5
25/5=5
 
        
             
        
        
        
Answer:
Step-by-step explanation:
f * g = (x^2 + 3x - 4) (x+4)
open bracket
x((x^2 + 3x - 4) + 4 (x^2 + 3x - 4)
x³ +3x²-4x+x²+12x-16
x³+3x²+x²-4x+12x-16
x³+4x²+8x-16 (domain is all real numbers.
f/g = (x^2 + 3x - 4)/(x+4)
factorising (x^2 + 3x - 4)
x²+4x-x_4
x(x+4) -1 (x+4)
(x+4)(x-1)
f/g = (x^2 + 3x - 4)/(x+4) =(x+4)(x-1)/(x+4) = (x-1)
Before factorisation, this was a rational function so the domain is all real numbers excluding any value that would make the denominator equal zero.
Hence I got x - 1, and x cannot equal -4
  So the domain is just all real numbers without -4