if you are trying to work out -3/4 - (-1/4 - 1/2) then the answer is 0
 
        
             
        
        
        
Answer:
yes because every time x changes y changes the same amount 
Step-by-step explanation:
 
        
             
        
        
        
Answer: 
Step-by-step explanation:
Hi, to answer this question we have to analyze the information given:
d = kilograms of dark chocolate
m =kilograms of milk chocolate
So, her recipe calls for twice the amount of dark chocolate as milk chocolate.
Mathematically speaking:
m = 2d
She needs to buy 120 kg, of chocolate in total. So;
m + d = 120
The following system of equations represent the situation:

 Feel free to ask for more if it´s necessary or if you did not understand something.