Not for sure but it’s most like 6/9
        
             
        
        
        
In the first series, the summation applies to the whole (2n+3) inside 
the parentheses, so the 3 gets summed up 5 times.
But in the second one, the summation only applies to the 2n , so 
the 3 is only added after the summation is finished.
The difference between five 3s the first time and one 3 the second time 
is your 12 .
        
                    
             
        
        
        
Answer:
A = 3244
B = 864
C = 3080
Step-by-step explanation:
  700 + a = 3944
  -700          -700
a = 3244
  3944 - b = c - 80 = 3000
c - 80 = 3000
   +80       +80
c = 3080
3944 - b = c ---> 3944 - b = 3080
                           -3944        -3944
                                -b = -864 --->   
 
 
        
             
        
        
        
If altogether they spent a total of $71,  and a cap cost $5, then the price of a t-shirt is $8. Option A is correct
From the question, we are told that all caps cost $5 each
Let the cost of each shirt be x:
If Andy bought a t-shirt and a cap for each of his six friends, there will be 6 shirts and 6 caps 
If <u>Bob returned two caps and two t-shirts</u>, there will be 4 caps and 4 shirts left
If <u>Carl bought three t-shirts and returned a cap,</u> the number of caps remaining will be 3 caps and the number of shirts remaining will be 7 shirts
If they spent a total of $71, this means;
3(5) + 7x = 71
15 + 7x = 71
7x = 71 - 15
7x = 56
x = 56/7
x = 8
This shows that the price of a t-shirt is $8
Learn more here: brainly.com/question/16510024
 
        
             
        
        
        
There are so many relationships between the original entity and new relation. 
The relation mapped from an entity involved in a 1:1 unary relationship contains a foreign key that correspond to its own primary key. 1 to one foreign key will be unique.