Answer:
31, 53,57,79,24,46,68
Step-by-step explanation:
13+18=31
35+18=53
57+18=75 
79+18=97
24+18=42
46+18=64
68+18=86 
 
        
             
        
        
        
The answer should be the first one, SF = 1/2
        
             
        
        
        
Answer:
602.42 million
Step-by-step explanation:
I know the answer is 602.42 million because I used addition and subtraction. 
First, I knew there was 5.66x 107 million students. So, I multiplied 5.66 and 107, and I got 605.62 million. I knew there were 3.2 million teachers in the US. Next, I subtracted 3.2 million from 605.62 million. 
605.62-3.2=602.42
So, there are 602.42 million more students than teachers in the United States. 
 
        
             
        
        
        
The markup cost is 475 dollars!
Hope this helps!
♤MidnightQueen
        
                    
             
        
        
        
0.25x+97
Factoring:
Convert 0.25 to a fraction:
1/4x+97
Factor out 1/4:
Solution:
1/4(x+388) or 0.25(x+388)