11tens the plus together equals to 110
        
             
        
        
        
Answer:
18 1/8
Step-by-step explanation:
4 7/8 x 4 = 23 1/2 
23 1/2 - 5 3/8 = 18 1/8
 
        
             
        
        
        
Angle =  36 degrees  =  

  = 

now, radius =  10 cm
so arc =  radius x angle  =  10 x pi/5  =   2pi  = 6.28 cm
 
        
        
        
Well i don't really understand it either because i don't know what your currently learning in school, but i guess you could use the guess and check method
        
             
        
        
        
I think it's a helping hand