If you divide each number by the previous one, you get:
-86 / -172 = 1/2
-43 / -86 = 1/2
-21.5 / -43 = 1/2
The common ratio is 1/2 = 0.5
80/100 = 0.80
x = 0.80
0.80x = 20
<span>x = 20/0.80 </span>
<span>x = 25
Hope this helps you!!! =')</span>
Answer: it C
Step-by-step explanation: if it not incorrect sorry for the wrong answer
The answer is c with a side of bacon hope that helps. :)