I hope this help in some sort of way you can message me if you need more help
 
        
        
        
9514 1404 393
Answer:
   -15/16   
Step-by-step explanation:
The sum of a geometric series with first term a1 is ...
   S = a1/(1 -r)
Then the common ratio (r) is ...
   r = 1 -a1/S
For the given values, the ratio is ...
   r = 1 - 124/64 = -15/16
The common ratio is -15/16.
 
        
             
        
        
        
(I'll assume that the blank spaces are PLUS signs ( + ),
as they usually are on Brainly.)
The mystery complex number is  (5 - i) .
     (3 + 2i) x (5 - i)  =  (17 + 7i)
FOIL it out and you'll see it.
        
             
        
        
        
Answer:
x=5/13
Step-by-step explanation:
2/3+7/2=9x+5/6+4x
2/3+7/2-5/6=9x+4x
lcm of 2,3,6=6
2/3=4/6      7/2=21/6       5/6=5/6
4/6+21/6-5/6=9x+4x
30/6=13x
5=13x
x=5/13