I don’t know I suck at math sadly
        
             
        
        
        
17 and -17
absolute value is just the distance the number is from zero
        
             
        
        
        
Answer – The sum of their measures is 180 degreed
When two diameters of the same circle intersect, four arcs are created. The 
following are true of these arcs:
- Opposite arcs are equal in measure
- The sum of the measure of adjacent arcs is 180 degrees
- The sum of the measure of all the arcs is 360 degrees
        
                    
             
        
        
        
Sum of series of G.P. = Sn = a(1-rⁿ) / 1-r
Here, a = 5
r = 1/5
Substitute their values into the expression:
Sn = 5(1-1/5⁵) / 1 - 1/5
Sn = 5*5/4 [1-1/3125]
Sn = 25/4 [ 3124/3125]
Sn = 781 / 125
In short, Your Answer would be 781/125 in fraction form 
or 6.248 in decimal form
Hope this helps!