1. The sum of 8pq and -17 pq is

2. The sum of 5x², -7x², 8x², 11x² and -9x² is

3. The sum of x² - y², y² - z² and z² - x² is

4. What do you get when you subtract -3xy from 5xy?

5. The result of subtraction of 7x from 0 is

6. The result of subtraction of 3x from -4x is

7. The product of 4mn and 0 is

8. The product of 5x and 2y is

9. The product of 7x and -12x is

10. The area of a rectangle whose length and breadth are 9y and 4y² respectively is