11-2x8-(-9)

To evaluate the given expression, we will follow the order of operations (PEMDAS).

First, we will deal with the parentheses:
-(-9) will become positive, so the expression becomes: 11-2x8+9

Next, we will do the multiplication and division from left to right:
- Multiply 2 by 8: 16
The expression becomes: 11-16+9

Now, we will do the addition and subtraction from left to right:
- Subtract 16 from 11: -5
The expression becomes: -5+9

- Add -5 and 9: 4

Therefore, 11-2x8-(-9) equals 4.