A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

gahm8684

  • one year ago

Hi I've been trying this problem for 3 times, but still don't get it. This is my last try, so i would appreciate someone clarifying this problem for me

  • This Question is Closed
  1. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    How many significant figures would be re- tained in the solution to [(2 + 0.0031) + (413 / 12)]×(2.45×1.83) = 1. three 2. two 3. zero 4. five 5. one 6. four

  2. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I know is not 5 even though the 2 is one digit

  3. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    also know is not zero because there are numbers with higher digits than 0

  4. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    and finally I know is not five just because

  5. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so my only possible answers are: number 1, or number 2

  6. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    http://www.usca.edu/chemistry/genchem/sigfig2.htm

  7. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    that doesn't really help

  8. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i was there already

  9. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    According to the link above the following information is relevant to your problem. When adding or subtracting numbers, count the NUMBER OF DECIMAL PLACES to determine the number of significant figures. The answer cannot CONTAIN MORE PLACES AFTER THE DECIMAL POINT THAN THE SMALLEST NUMBER OF DECIMAL PLACES in the numbers being added or subtracted. When multiplying or dividing numbers, count the NUMBER OF SIGNIFICANT FIGURES. The answer cannot CONTAIN MORE SIGNIFICANT FIGURES THAN THE NUMBER BEING MULTIPLIED OR DIVIDED with the LEAST NUMBER OF SIGNIFICANT FIGURES. This information tells exactly how to figure out the correct answer. Takes a bit of work on your part, but yes you can figure it out.

  10. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah I know, so the answer would be to solve the equation, and since the 2 has only 1 digit or significant figure the answer would be round to one digit

  11. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    this means the equation would equal to 200

  12. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    What equation? Equations have equal signs.

  13. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    However the answer is not 1(or number 5)

  14. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I meant problem, I'm sorry

  15. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Maybe i read the question wrong, but thats what I need a guide

  16. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Explain how you went about eliminating options.

  17. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I tried #5, and it was wrong. I know that it is not five digits because there is no number with 5 digits, and if there was there is numbers with less digits.

  18. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    and I'm not sure why it can't be three, two, or four digits

  19. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    What was the result you got before rounding up to 200 (which you should not have done).

  20. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    163.2880239

  21. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Mind showing how you got that step by step?

  22. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I plot the whole problem in the calculator

  23. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    No, you shouldn't have.

  24. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    but I know I first would have to solve whats inside the keys

  25. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    or i don't know what they are called in english

  26. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    You have to perform each operation one step at a time while following the rules for significant digits.

  27. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    alright so: ((2+0.0031)+(41/12)=40

  28. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    because i had to round up

  29. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    to one digit right?

  30. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    now I solve the whole thing 40×(2.45×1.83)=179.34

  31. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    then I have to round up to 1 digit since 40 mis the lowest significant figure and it only has one digit

  32. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    this means 179.34 rounds up to 200

  33. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    right?

  34. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    You should follow ORDER of OPERATIONS. Multiply BEFORE adding from left to right.

  35. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    (2 + 0.0031) + (413 / 12)]×(2.45×1.83) =[(2+0.0031)+(413/12)]x(4.4835)

  36. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    is that what you meant?

  37. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Okay, yes, we should keep track of parentheses as well. You should have gotten 4.48 for (2.45×1.83)

  38. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oh right because there is 3 digits in there

  39. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    make sense

  40. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    The result can only be accurate to two decimal places.

  41. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    For that operation

  42. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    [(2.0031)+(34.42)]x(4.4835)

  43. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    The result of an operation can only be accurate to the number with the least amount of decimal places. In other words, you should not have decimal places when dividing whole numbers.

  44. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    [(2+0.0031)+(34)]x(4.4835)

  45. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    now I add the ones inside, right?

  46. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Yep, but add according to the rules.

  47. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    it would be 2.0

  48. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i mean 2

  49. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    the lowest is 2 thats why, so 2+34=36=40

  50. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    [40]x(4.48)=179.2

  51. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    What rule says to round 36 to 40?

  52. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    40 has only 1 digit. I rounded to one digit because of the two

  53. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    How many significant figures does 4.48 have?

  54. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    3

  55. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    By the way, you shouldn't round 36 to 40.

  56. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    alright

  57. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so 36(4.48)=180

  58. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    36 has two significant digits which means our result should have only two significant digtts.

  59. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    let me try, I'm gonna submit

  60. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Yes! it was 2 thank you so much

  61. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    you helped me understanding it. The calculator is worthless!

  62. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    The calculator does not know how to deal with significant digits unless you program it to do so.

  63. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    but i guess there is some calculators that do, right?

  64. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Perhaps Wolfram Alpha does, but you would still have to use a special program for it. It won't do it automatically.

  65. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    The calculator doesn't know you want to round to significant digits.

  66. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah of course

  67. Hero
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Good luck with the rest of your homework. Have a good one.

  68. gahm8684
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank you! you too

  69. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.