Let's calculate the value of each expression:
1. -12 x -2 = 24
2. 9 + (-3) = 6
3. 12 - (-2) = 14
4. -7 - 3 = -10
5. -9 ÷ 3 = -3
6. 2 ÷ (-2) = -1
7. 4x - 11 = This is an algebraic expression and cannot be simplified to a single value without knowing the value of 'x.'
8. 5 + (-6) = -1
9. 27 ÷ (-9) = -3
10. -5x - 20 = This is another algebraic expression that requires the value of 'x' to be evaluated.
11. -6 + (-17) = -23
For expressions involving variables (7 and 10), you would need to know the value of 'x' to calculate them further.