Answer:
2. 9
Explanation:
If you look at the chart, for 1.5 kilograms, there are 3 pounds, for 2.5 kilograms, there are 5 pounds, and for 3.5 kilograms there are 7 pounds. If you continue the pattern, you will have 4.5 kilograms equal to 9 pounds.
Also, if you look at the chart, the spot where 4.5 would be is where 9 is, if you want to check your work.