The correct answer would be: 6x+5y=3. I am not entirely sure, but that's what I believe is the correct answer.-Hope this helped!
        
             
        
        
        
Answer: You determine the coefficient by looking to see if there is a number in front of a variable. If there is a  number in front of the variable, then that is the coefficient. The coefficient is the number, and the variable is the letter. 
Step-by-step explanation: Hope this helps
 
        
             
        
        
        
Answer:
The correct answer is B
(3.98x10^8)-(3.28x10^8)=74000000
74000000
= 7.4x10^7
 
        
             
        
        
        
Answer: 715 ( C )
Explanation:
C (13,4) = (13!)/(4!*9!)
So it can be done on the calculator by 13C4  
13! = 13 x 12 x 11 x 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1
4! = 4 x 3 x 2 x 1
9! = 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1
13 x 12 x 11 x 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 / ( 4 x 3 x 2 x 1 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 )
6,227,020,800 / 8,709,120
=715
So the correct answer is C, 715
 
        
                    
             
        
        
        
Answer: -3<5?
Step-by-step explanation: Not sure. Sorry