Step-by-step explanation:
The formula for arc length [for the angle in degrees] is:

here, 
 = degrees
 = degrees 
 = radius
 = radius
using this we'll solve all the parts: 
r = 10, n = 20:


from here, it is just simplification:
2 and 360 can be resolved: 360 divided by 2 = 180

10 and 180 can be resolved: 180 divided by 10 = 18

finally, both 20 and 18 are multiples of 2 and can be resolved:

 Option (E)
 Option (E)
r=3, n=6:


 Option (D)
 Option (D)
r=4 n=7


 Option (C)
 Option (C)
r=2 n=x


 Option (D)
 Option (D)
r=y n=x


 Option (E)
 Option (E)
 
        
             
        
        
        
An example would be: 
Standard:12345678
Expanded: 10000000+2000000+300000+40000+5000+600+70+8
Word: twelve million three hundred forty-five thousand six hundred seventy-eight
        
             
        
        
        
Answer: 13/20 of the video games at both of their houses.
Step-by-step explanation: The equation is 1/4 + 2/5. You need to find their common denominator which is 20, so the equation is now 5/20 + 8/20 = 13/20, which can't be simplified.
 
        
             
        
        
        
Answer:
b6 2hich method
Step-by-step explanation:
I solv3 this
 
        
                    
             
        
        
        
6+2=8, right? Okay. Next, all you have to do is take away the equation "6+2". Now what you have is... 8x5. That's easy! 40. This is a very easy problem if you think about it.