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anonymous

  • one year ago

Determine the answer to 3 + (−5) and explain the steps using a number line.

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  1. DanJS
    • one year ago
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    what are you having trouble with?

  2. anonymous
    • one year ago
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    i dont really understand how to find the answer

  3. DanJS
    • one year ago
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    I think this wants to show you how a negative number moves left and positive to the right...so.. plus a negative number is the same as just subtraction 3 - 5

  4. DanJS
    • one year ago
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    it is saying +(move right) by (-5) which itself moves left

  5. anonymous
    • one year ago
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    yea i know 3+(-5)= 3-5, but i still cant get the answer

  6. anonymous
    • one year ago
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    so what your saying is go right 3 times and then lest 5

  7. anonymous
    • one year ago
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    because i thought that was how u do it but i was confused

  8. horsegal244
    • one year ago
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    No its a negative

  9. DanJS
    • one year ago
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    no just remember, a + (-b) = a - b plus a negative is subtraction

  10. anonymous
    • one year ago
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    so is the answer -2

  11. DanJS
    • one year ago
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    if you add a negative number to a value on the numberline, you move left, same as if you just had subtracted it

  12. DanJS
    • one year ago
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    the other one is minus a negative number, same as just addition a - (-b) = a + b

  13. anonymous
    • one year ago
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    i really need to get a good grade on this test. i did the number line and went from 0 to 3 then i went left 5 times and i got -2

  14. anonymous
    • one year ago
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    is that the right answer?

  15. DanJS
    • one year ago
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    oh number line... forgot

  16. DanJS
    • one year ago
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    3 + (−5) start at 3, move left 5 to -2

  17. anonymous
    • one year ago
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    so then i got the correct answer?

  18. DanJS
    • one year ago
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    |dw:1441228943457:dw|

  19. anonymous
    • one year ago
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    i dont get that

  20. anonymous
    • one year ago
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    i started at 0 and went right till i got to the number 3. then i went left 5 times but started at 3 instead of 0 and i got -2. Is this right or wrong?

  21. DanJS
    • one year ago
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    |dw:1441229061848:dw|

  22. DanJS
    • one year ago
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    the upper one is just showing the distance between 3 and -2, not sure what you have to include on your graph

  23. anonymous
    • one year ago
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    just explain how to get the answer... or how u got the answer using the number line

  24. anonymous
    • one year ago
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    the explanation that i said earlier was it right or wrong

  25. DanJS
    • one year ago
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    oh they want you to start at zero? then to show 3 - 5 = -2 ... start at zero, move +3, then move -5, end on -2

  26. anonymous
    • one year ago
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    thank you. i really needed to make sure i had the right answer

  27. anonymous
    • one year ago
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    can you help me with something else?

  28. DanJS
    • one year ago
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    sure, i have a couple min

  29. anonymous
    • one year ago
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    ok

  30. anonymous
    • one year ago
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    Andrew is showing his work in simplifying −4.5 + 4.2 + 5.6 − 7.3. Identify any errors in his work or in his reasoning. Write feedback to Andrew explaining the mistake he made and how to correct his work. Step Work Reasoning −4.5 + 4.2 + 5.6 − 7.3 Original problem 1 −4.5 + 4.2 + 5.6 + (−7.3) Additive inverse 2 −4.5 + (−7.3) + 4.2 + 5.6 Commutative property 3 (−4.5 + (−7.3)) + (4.2 + 5.6) Associative property 4 −11.8 + 9.8 Simplify 5 −21.6 Simplify

  31. DanJS
    • one year ago
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    k..

  32. anonymous
    • one year ago
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    in the original problem the 7.3 is positive, why in 1. he wrote it was negative

  33. DanJS
    • one year ago
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    The 7.3 is negative in the original

  34. DanJS
    • one year ago
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    the only thing i see is in the simplifying step

  35. DanJS
    • one year ago
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    -11.8 + 9.8 = -2 not what he wrote -21.6

  36. anonymous
    • one year ago
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    but were does he make his first mistake?

  37. anonymous
    • one year ago
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    In the original problem 7.3 is positive, when Allen wrote it as commutative and additive inversion, he wrote it as a negative. That was one mistake. Another mistake was that since 3.7 is not negative, he does not need an extra set of parentheses for 7.3. instead of (−4.5 + (−7.3)) + (4.2 + 5.6) it should be (-4.5 + 7.3) + (4.2 + 5.6). Since he messed up with all that, the way he simplified his answer is wrong too.

  38. anonymous
    • one year ago
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    is this correct?

  39. DanJS
    • one year ago
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    why are you saying 7.3 is positive? −4.5 + 4.2 + 5.6 − 7.3 was given

  40. anonymous
    • one year ago
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    isnt that infront of 7.3 a subtraction

  41. DanJS
    • one year ago
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    all the numbers look good to me except for the last simplifying step where he subtracted instead of added.. if the original prob is copied wrong, then i guess that too, or maybe the additive inverse thing as well...

  42. DanJS
    • one year ago
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    got to run.. sorrry . be back later

  43. anonymous
    • one year ago
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    ok thank you for the help

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spraguer (Moderator)
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is replying to Can someone tell me what button the professor is hitting...

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