Cross multiplication 13x -13 = 8x+12 
combining like terms 13x -8x =12 +13
5x= 25     x= 5
x=5
        
             
        
        
        
Answer:
1 time
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer: 1:10,000
Step-by-step explanation:
given data:
distance of the nearest star system = 100,000,000
distance to size ration of the sun earth system = 10,000
therefore;
100,000,000 / 10,000
= 10,000
The order of magnitude of the distance to size ratio of the Sun- Nearest Star system is about 1:10,000 times that of the Sun-Earth system. 
 
        
             
        
        
        
Answer:
There are 210 students running track and 98 students that play baseball.
Step-by-step explanation:
15*14= 210 and 7*14 = 98, 210 - 98 = 112. If this was correct feel free to mark me as brainiest :)