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anonymous

  • one year ago

Which expression is less than -(-I-4.2I)?

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  1. anonymous
    • one year ago
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    @jim_thompson5910

  2. jim_thompson5910
    • one year ago
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    what is `I-4.2I` equal to?

  3. anonymous
    • one year ago
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    "brain fart" i dont know...

  4. jim_thompson5910
    • one year ago
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    how far is -4.2 from 0 on the number line?

  5. jim_thompson5910
    • one year ago
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    |dw:1442363852087:dw|

  6. anonymous
    • one year ago
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    -4.2? or 4.2?

  7. shreenithaa
    • one year ago
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    4.2 since the jumps are considered as positive

  8. jim_thompson5910
    • one year ago
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    exactly as shreenithaa said the distance is never negative

  9. jim_thompson5910
    • one year ago
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    it doesn't make sense to have the distance be say -20 miles

  10. anonymous
    • one year ago
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    Yup. lol

  11. jim_thompson5910
    • one year ago
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    so that is why `|-4.2| = 4.2`

  12. jim_thompson5910
    • one year ago
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    the absolute value represents distance from 0 the absolute value result is never negative

  13. shreenithaa
    • one year ago
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    maybe the "expression" is (there can be any but has to be less than the solution the problem above" 10.42/x

  14. anonymous
    • one year ago
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    -(-4.2) I-4.2I I-(-4.2)I -I-(-4.2)I These are my possible answers.

  15. shreenithaa
    • one year ago
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    why do u need the one at the end and it has to have a variable in order for it to be an expression

  16. anonymous
    • one year ago
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    I have no idea?

  17. anonymous
    • one year ago
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    I am just putting what it says in my study book.

  18. shreenithaa
    • one year ago
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    now im confused????? :(

  19. shreenithaa
    • one year ago
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    what grade r u in

  20. anonymous
    • one year ago
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    11th.

  21. shreenithaa
    • one year ago
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    then i wont understand i am in 8th no wonder why anyways just incase, what book do u have

  22. anonymous
    • one year ago
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    Its an algebra II book.

  23. shreenithaa
    • one year ago
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    i have algebra 1 maybe i dont have the answer sorry :(

  24. anonymous
    • one year ago
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    Its fine:) thanks for trying!

  25. shreenithaa
    • one year ago
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    ur welcome..

  26. anonymous
    • one year ago
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    @jim_thompson5910 got anything?

  27. shreenithaa
    • one year ago
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    i think i got something i searched up expression in google and this is what i got In mathematics, an expression (or mathematical expression) is a finite combination of symbols that is well-formed according to rules that depend on the context. Mathematical symbols can designate numbers (constants), variables, operations, functions, punctuation, grouping, and other aspects of logical syntax.

  28. jim_thompson5910
    • one year ago
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    so what we did so far is compute that I-4.2I = 4.2 we can replace the entire `I-4.2I` with `4.2` so `-(-I-4.2I)` becomes `-(-4.2)` agreed?

  29. anonymous
    • one year ago
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    Would that be the answer?

  30. jim_thompson5910
    • one year ago
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    no we're working to evaluate what number `-(-I-4.2I)` is equal to. Don't worry about the final answer right now

  31. anonymous
    • one year ago
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    Aren't we trying to find what is less?

  32. anonymous
    • one year ago
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    Or do you want to find what is equal first?

  33. jim_thompson5910
    • one year ago
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    well the first step is to figure out what number `-(-I-4.2I)` is equal to then we do the same with each answer choice once we get single numbers, we can do comparisons to see which is smaller

  34. anonymous
    • one year ago
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    So its equal to 4.21? or? sorry I really suck at math.

  35. jim_thompson5910
    • one year ago
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    hopefully you agree that |-4.2| = 4.2 and hopefully you see why `-(-I-4.2I)` becomes `-(-4.2)`

  36. jim_thompson5910
    • one year ago
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    what would `-(-4.2)` turn into?

  37. anonymous
    • one year ago
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    I do agree and see.

  38. anonymous
    • one year ago
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    Wouldn't it be 4.2? or -4.2? It can't be negative right?

  39. jim_thompson5910
    • one year ago
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    the two negatives cancel to form a positive

  40. anonymous
    • one year ago
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    so 4.2

  41. jim_thompson5910
    • one year ago
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    yes

  42. jim_thompson5910
    • one year ago
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    in the end, `-(-I-4.2I)` boils down to the single number `4.2`

  43. anonymous
    • one year ago
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    But there's three negatives? do they all cancel out eachother?

  44. jim_thompson5910
    • one year ago
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    for each of these answer choices below -(-4.2) I-4.2I I-(-4.2)I -I-(-4.2)I you'll do the same thing: simplify as much as possible after simplification, you compare

  45. jim_thompson5910
    • one year ago
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    but remember, I-4.2I turned into +4.2 or just 4.2

  46. jim_thompson5910
    • one year ago
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    which is why we got to -(-4.2)

  47. anonymous
    • one year ago
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    So I think the last one is the answer.

  48. jim_thompson5910
    • one year ago
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    \[\Large -(-|-4.2|)\] \[\Large -(-\color{red}{|-4.2|})\] \[\Large -(-\color{red}{4.2})\]

  49. jim_thompson5910
    • one year ago
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    `So I think the last one is the answer.` why do you think that?

  50. anonymous
    • one year ago
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    I changed my mind.

  51. anonymous
    • one year ago
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    For all the equations, you could simplify is pretty much to all the same thing. right?

  52. jim_thompson5910
    • one year ago
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    let's go through all the choices choice A -(-4.2) simplifies to ???

  53. anonymous
    • one year ago
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    4.2

  54. jim_thompson5910
    • one year ago
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    choice B I-4.2I simplifies to ???

  55. anonymous
    • one year ago
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    4.2

  56. jim_thompson5910
    • one year ago
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    choice C I-(-4.2)I simplifies to ???

  57. anonymous
    • one year ago
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    4.2

  58. jim_thompson5910
    • one year ago
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    choice D -I-(-4.2)I simplifies to ???

  59. anonymous
    • one year ago
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    -4.2?

  60. jim_thompson5910
    • one year ago
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    good

  61. anonymous
    • one year ago
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    Thats why I though it was the answer. It ends up being less?

  62. jim_thompson5910
    • one year ago
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    so the problem boils down to this question: which number is less than 4.2? choice A) 4.2 choice B) 4.2 choice C) 4.2 choice D) -4.2

  63. anonymous
    • one year ago
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    D:)

  64. jim_thompson5910
    • one year ago
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    yes it's choice D. I just wanted to be sure you understand why it's D

  65. anonymous
    • one year ago
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    I did! from the beginning. Just over thought, and said "wait no, I'll sound stupid"..

  66. jim_thompson5910
    • one year ago
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    Don't worry about sounding stupid. Most often, you have the right answer on the first try. So go with your gut

  67. anonymous
    • one year ago
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    Which I should of explained in the beginning. Because I just sounded super stupid lol

  68. jim_thompson5910
    • one year ago
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    you did great

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