Answer: 2 / 5x
Explanation:
C would be the answer. When you simplify the equations C does not contain a radical.
Independent variable (IV): something the scientist can change.
Thus, in this case, the IV can be the weight of the person.
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