1. 4 × (-1) is equal to

2. (-10) × 0 × (-15) is equal to

3. The integer whose product with (-1) is 0, is

4. The integer whose product with (-1) is 1, is

5. 10 ÷ (-5) is equal to

6. (-6) ÷ (-3) is equal to

7. (-5) ÷ 1 is equal to

8. (-9) ÷ (-1) is equal to

9. If 16 ÷ x = 16, then x is equal to

10. If (-50) ÷ x = 1, then x is equal to