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October 2nd, 2009, 03:15 PM   #1
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Check my work

Could you check my work and see if im corect on the following? if you could help on some i have not yet answered that would be great, i understand this alot more then geometry when getting help
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October 2nd, 2009, 08:09 PM   #2
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It's unclear how you can "show your work" for true/false questions.

Questions 1 - 4, 11 - 13, 21 - 28, 30, 36, and 43 - 45 are answered correctly.

5. Expressions
6. False
7. True
8. False
9. True

14. Incorrect: instead, 3rd line should be 25 - 14 and so the final answer should be 11.

15. Incorrect: as in 14, do both multiplications first, then the subtraction. Your final step is also incorrect.
16. Incorrect: the exponentiation should be done first, then the division, and last the subtraction.
17. Incorrect: do the exponentiation, then the multiplication, then the subtraction, then the addition; finally, the division.
18. Incorrect: 9 = 81, not 18.
19. Incorrect: do the exponentiation first, then the multiplications in the numerator, then the subtractions, then the multiplication, then the division.
20. Incomplete: there are two questions and you answered the second correctly after ignoring the first.

(Do questions 15 - 20 again, showing your improved work. Try to find out about order of operations first.)

29. -(-11) = 11
31. -17
32. -3 + (-5) + 9 = -3 - 5 + 9 = -8 + 9 = 1 (this is mainly working from left to right)
33. Incorrect: evaluate -8 - 9 from left to right to get -17.
34. The answer is -48. Can you now see why?
35. Your final answer of 1 is correct, but your working is either misleading or incorrect.
37. Incorrect: the answer should be 9.
38. Incorrect: x - 2y = -6 - (-6) = 0.
39 - 42. At least make an attempt at these.
46. Continue by subtracting 2x from each side.
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October 4th, 2009, 05:36 PM   #3
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Re:

Quote:
Originally Posted by skipjack
It's unclear how you can "show your work" for true/false questions.

Questions 1 - 4, 11 - 13, 21 - 28, 30, 36, and 43 - 45 are answered correctly.

5. Expressions
6. False
7. True
8. False
9. True

14. Incorrect: instead, 3rd line should be 25 - 14 and so the final answer should be 11.

15. Incorrect: as in 14, do both multiplications first, then the subtraction. Your final step is also incorrect.
16. Incorrect: the exponentiation should be done first, then the division, and last the subtraction.
17. Incorrect: do the exponentiation, then the multiplication, then the subtraction, then the addition; finally, the division.
18. Incorrect: 9 = 81, not 18.
19. Incorrect: do the exponentiation first, then the multiplications in the numerator, then the subtractions, then the multiplication, then the division.
20. Incomplete: there are two questions and you answered the second correctly after ignoring the first.

(Do questions 15 - 20 again, showing your improved work. Try to find out about order of operations first.)

29. -(-11) = 11
31. -17
32. -3 + (-5) + 9 = -3 - 5 + 9 = -8 + 9 = 1 (this is mainly working from left to right)
33. Incorrect: evaluate -8 - 9 from left to right to get -17.
34. The answer is -48. Can you now see why?
35. Your final answer of 1 is correct, but your working is either misleading or incorrect.
37. Incorrect: the answer should be 9.
38. Incorrect: x - 2y = -6 - (-6) = 0.
39 - 42. At least make an attempt at these.
46. Continue by subtracting 2x from each side.

Thanks bro! Im starting to understand the order of operations... Thanks so much for the help! i understood everything!
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