Add together the following quantities:

13.

a+11bc-3x+17x+3a-11bc+17a-14+7x

-34a+16bc.

14. 3a-x+41 +3ac-11a+34+7ac-3ac+4a-5

15.

+4bc.

16.

7a-3bc+4ac+9a-11+11a-11bc+4ac-7

34ac-7a+14-11ac +11-8a+ c.

Add together the following quantities:17.

17ac-3a+4c; 8c-4a+4ac; and 3ac-4c+6a 18. 3ax+bay - 3cy; 11bxy + 6cy - 6cx; and 11ax+3cy-11bxy.

19. Add together the following:-17 cows, 3 horses, and 9 pigs; 11 cows, 12 horses, and 8 pigs; 17 horses, 9 cows, and 13 pigs; 11 pigs, 16 cows, and 3 horses.

20. Add together the following:- 6 cows, 3 pigs, and 9 carts; -17 cows-13 pigs and 21 carts; and 17 carts-14 pigs and 7 cows.

21. (7a-c+6b)+(3a-4c+8b)-11a+4c. 22. 34a+ax+by-(11a-ax-by)+11ax.

23.

a+b-c+b−c+4a-c+x.

24. 3a2+x+y2; 4x2-y2-3x2; 11y2-18a2+14x2. 25. 11abx 3acx+4adx-31adx + 11acx - abx +16acx-11adx+14abx.

Find the sum of—

26. 4a-2b+3-3a+4b-8+16a+3b-9+6a. 27.

ax+bx+cx-11+11ax +4bx-8cx+19+3αx

-6bx+8cx+31-17.

28. x+9bxy+3bxy+3x-9bxy-8bxy-11x-3bxy

29. a2b2-3abx+7ax-8a2x2+11a2x2+8abx+17ax -8ax.

-

30. 3axy-74axy2-11ax+7-64axy+14axy+11

-6аx+7ax+axy+axy2+ax.

31. 11ax-by+3ax-4by+81-17axy+axy.

58. 6a2-362+5d-8a2+6d-8b2+6-11a2+6d.

59. 7atx 4cx+8cd6abx+4cx +7cx-8cd+11--8abx.

- 11cd+8abx

60. 4-11by+cx−8+8by—4cx+8cx—9by+11. 61. 8aby4acy + 6cy+bx-8axy + 8acy - 8cy -4bx-8bx+8cy-8acy +11aby.

8axy+8acy

62. 4a2+b2+c2 -- 8a2 +862—12c2 — 8c2+862 — 12a2 +84.

63. (axy + bxycy) + (6axy - 7bxy + 11cy) +(3axy+6bxy-12y)+11axy-6bxy.

64. (a2+2ab+b2) — (a2 — 2ab+b2) −(a2+2ab+b2). 65. (x2-y2)-(x2+y2)+2xy−3x2+4y2.

66. a2-3ab2+x2—6a2+6ab2—4x2 — (a2 — x2).
67. 3x2-4xy+y2-(3x2-4xy+y2)-8xy.
68. 6-11ax-4by+6-12ax+8by-(by+ax).
69. 16-8ax+6by-11ax+12by-8by-11ax.
84ax-6by—8bx—74ax+7by+6bx−12.

70.