Simplify by using the distributive property. 1. (2x + 1)(x - 6) 2. (2y - 3)(y + 2) 3. (5y - 2)(3y - 1) 4. (5z + 1)(5z -1) 5. (2x + 3)(2x + 3) 6. (x + y)(x + y) 7. (a - b)(a - b) 8. (a + b)(a + b) 9. (a + 2b)(a + 3b) 10. (2c - d)(3c + d) 11. (x - 4y)(x + 4y) 12. (2z + 5w)(3z - 4w) 13. (5y + 12x)(7x - 2y) 14. (5k + 2m)(3p + 4s) 15. (9x - 5y)(2x + 3y) 16. (x3 - 3x2 + 2x - 4)(3x - 1) 17. (3y2 - 9y + 4)(4y + 5) 18. (3x2 - 4xy + y2)(4x + 3y) 19. (4a2 - 3ab - 2b2)(2a - 5b) 20. (x - y)3