Answer: 2
As you can see, In the list of Numbers there are TWO SETS of 8.5 (As shown, I circled the two) meaning you should put 2 "x's" over 8.5. If you need more of an explanation, please let me know.
If available please give me a Branliest. It would be much appreciated, and it would also help me answer more and more difficult questions! Good luck.
-MathHotdog •~•