The answers to the AMC (American Mathematics Competition) 10B 2010 are:
1. C
2. C
3. C
4. C
5. B
6. B
7. D
8. E
9. D
10. C
11. A
12. D
13. C
14. B
15. C
16. B
17. B
18. E
19. B
20. D
21. E
22. C
23. D
24. E
25. B
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It is: (10b+7)(10b-7)
It is equivalent to: 10b-25
The answers to the AMC 12A (American Mathematics Competition) from 2010 are: 1. C 2. A 3. E 4. D 5. C 6. E 7. C 8. C 9. A 10. A 11. C 12. D 13. C 14. B 15. D 16. B 17. E 18. D 19. A 20. C 21. A 22. A 23. A 24. B 25. C The answers to the AMC 12B 2010 are: 1. C 2. A 3. E 4. B 5. D 6. D 7. C 8. B 9. E 10. B 11. E 12. D 13. C 14. B 15. D 16. E 17. D 18. C 19. E 20. E 21. B 22. D 23. A 24. C 25. D
if x=4 (which I am assuming) 8x-10bx 8(4)-10b(4) 32-40b8(4-10b)
Any number multiplied by zero is zero. (10b also means 10 times zero.)