Its not really hard you just have to explain when like its not really complicated
        
             
        
        
        
Any one of the runners could be 1st. 
Every runner except for the one that was 1st could be 2nd.
Every runner that wasn't 1st or 2nd could be 3rd. 
100*99*98=970200 groups.
 This involves permutations because order does matter.
Hope this helps!
        
             
        
        
        
If you add positive 5 and positive 5, you'll get positive 10.
If you add positive 5 and negative 5, you'll get positive 0.
If you add negative 5 and negative 5, you'll get negative 10.
-5 + 5 = -5 + 5
5 + 5 = 5 + 5
- 5 + -5 = -5 + -5
Does that help your question?
        
             
        
        
        
Answer:
a. -5/2
Step-by-step explanation:
 
        
             
        
        
        
The question ask to determine what is a regular polygon that contains an interior angle of 9000 degree, base on my research, according to the geometrical research, I would say that the said polygon is a 52 sided convex polygon. I hope this would help