Using x for the variable, the inequality will be ...
9.50 +3.50x ≤ 35
3.50x ≤ 25.50
x ≤ 51/7 ≈ 7.3
Anna cannot buy negative snacks, and she cannot buy fractional snacks. Of the numbers listed, only 2 and 4 are integers between 0 and 7 (inclusive). The values below 7.3 are all solutions to the inequality. The value 9 1/2 is too large to be a solution to the inequality.
Only 2 and 4 are solutions to both the problem and the inequality.