2-9+9-16+13

To solve this expression, we need to combine like terms:

2 - 9 + 9 - 16 + 13 = (2 + 9 + 9 + 13) - 16 = 33 - 16 = 17

Therefore, the result of the expression 2 - 9 + 9 - 16 + 13 is 17.