Answer:
A and A is the answer. so this is the answer 
 
        
                    
             
        
        
        
Answer:
The unknown number is -5. 
Step-by-step explanation:
-3 + -5 = -8
-8 - -3 = -5
-8 - -5 = -3
 
        
             
        
        
        
Answer:
x,y,x = 2,4, -3
Step-by-step explanation:
 
        
             
        
        
        
12 is the number of $10 bills
20 is the number of $20 bills
<u><em>Step-by-step explanation:</em></u>
<u><em /></u>
Hello,
<u>Let's note</u> 
a    the number of $10 bills
b    the number of $20 bills
The total value is $520 so we can write the first equation (1)
     
We know that there are 32 bills in total so we can write the second equation (2)
     
(1) - 10*(2) gives
10a + 20b - 10(a+b) = 520 - 320 = 200
10a + 20b - 10a - 10b = 10b = 200
So b = 200/10=20
and then from (2) a = 32 - 20 = 12
Hope this helps.
Do not hesitate if you need further explanation.
Thank you
 
        
             
        
        
        
total mass = mass of a bag of candy + mass of a chocolate bar 
total mass = 80g +110g = 190g