Answer:
-4/5
Step-by-step explanation:
r=x/2
a=2x
ar²=-1/16
x^3=-1/8
x=-1/2
sn=a/1-r
=-4/5
C
Hope this Helps :)
Your answer would be 19.
7 + 9 = 16
16 + 3 = 19
11.1