The answer is D because when you put the missing value which is x you replace it to 10 and then you solve it I hope this helps
The answer is no solution, if my math is correct.
I don’t think you pick an answer you just put all of those formulas and solutions into your calculator and that will give you what you need to move onto the next question/ step
7/2,14/4,21/6,28/8,35/10,42/12,49/14,56/16,63/18,70/20