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juciystar234

  • 3 years ago

8- 6.2 divided by 5 + 7(0.91) help me please

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  1. niduj123
    • 3 years ago
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    13.3

  2. juciystar234
    • 3 years ago
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    My textbook says 13.13 so I was wondering how they got that. Can you show me/ Tell me how you got that answer because I'm kinda confused...

  3. niduj123
    • 3 years ago
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    its easy bc its basic order of operations

  4. juciystar234
    • 3 years ago
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    Yeah I know NVM :) thanks

  5. niduj123
    • 3 years ago
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    can i hav a medal o.O

  6. niduj123
    • 3 years ago
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    tyvm

  7. juciystar234
    • 3 years ago
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    np

  8. asnaseer
    • 3 years ago
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    for this:\[\frac{8- 6.2}{5 + 7(0.91)}\] you need to follow BODMAS - have you heard about that?

  9. asnaseer
    • 3 years ago
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    it is known by other names as well, see here: http://en.wikipedia.org/wiki/Order_of_operations

  10. juciystar234
    • 3 years ago
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    Ok let me check it out hold on

  11. asnaseer
    • 3 years ago
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    look at the 2nd section "The standard order of operations"

  12. juciystar234
    • 3 years ago
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    Ok hold on hmm SO MANY WORDS!! D:

  13. niduj123
    • 3 years ago
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    lol typical wikipedia

  14. juciystar234
    • 3 years ago
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    Ok I kinda got it

  15. juciystar234
    • 3 years ago
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    (not really so much)

  16. niduj123
    • 3 years ago
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    kwl i hope u pass :)

  17. asnaseer
    • 3 years ago
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    good - so first thing to attack is the brackets

  18. juciystar234
    • 3 years ago
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    Thanks

  19. juciystar234
    • 3 years ago
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    Ok

  20. niduj123
    • 3 years ago
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    ^^...

  21. asnaseer
    • 3 years ago
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    in this case the brackets just contain a number - so no actual operation to perform inside the brackets

  22. juciystar234
    • 3 years ago
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    ok

  23. asnaseer
    • 3 years ago
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    we can therefore remove the brackets to end up with:\[\frac{8- 6.2}{5 + 7(0.91)}=\frac{8- 6.2}{5 + 7*0.91}\]

  24. juciystar234
    • 3 years ago
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    :p

  25. juciystar234
    • 3 years ago
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    Mhm ok

  26. juciystar234
    • 3 years ago
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    hmmm ok im confused...

  27. asnaseer
    • 3 years ago
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    lets jus concentrate on the denominator for now, we had:\[5+7(0.91)\]correct?

  28. juciystar234
    • 3 years ago
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    yes

  29. asnaseer
    • 3 years ago
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    now note that a(b) simply means a*b - agreed?

  30. juciystar234
    • 3 years ago
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    ok

  31. juciystar234
    • 3 years ago
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    agreed

  32. asnaseer
    • 3 years ago
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    so we can say that:\[5+7(0.91)=5+7*0.91\]

  33. asnaseer
    • 3 years ago
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    does that make sense now?

  34. juciystar234
    • 3 years ago
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    ok got tht

  35. juciystar234
    • 3 years ago
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    yes

  36. asnaseer
    • 3 years ago
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    good - now what should the next set of operations be?

  37. asnaseer
    • 3 years ago
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    we have handled the brackets

  38. juciystar234
    • 3 years ago
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    um to multiply?>

  39. juciystar234
    • 3 years ago
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    sorry didnt mean to put >

  40. asnaseer
    • 3 years ago
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    it should be exponents and roots next - but you do not have any here so we go to the next one: multiplication an division

  41. juciystar234
    • 3 years ago
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    Yea!! Ok

  42. asnaseer
    • 3 years ago
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    so what is 7 * 0.91 = ?

  43. juciystar234
    • 3 years ago
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    Um hold on

  44. juciystar234
    • 3 years ago
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    6.37

  45. asnaseer
    • 3 years ago
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    correct, so now we end up with:\[\frac{8- 6.2}{5 + 7(0.91)}=\frac{8- 6.2}{5 + 7*0.91}=\frac{8- 6.2}{5 + 6.37}\]now most people get confused here because they think the next thing to do is the division

  46. juciystar234
    • 3 years ago
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    wouldnt you add? or subtract?

  47. juciystar234
    • 3 years ago
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    add?

  48. asnaseer
    • 3 years ago
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    but what you need to remember is that you go through BODMAS for the numerator and the denominator seperately

  49. juciystar234
    • 3 years ago
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    ok

  50. asnaseer
    • 3 years ago
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    hang on a second - I think I misread your question

  51. asnaseer
    • 3 years ago
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    I believe it was this instead:\[8- 6.2 \div 5 + 7(0.91)\]

  52. asnaseer
    • 3 years ago
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    am I right?

  53. juciystar234
    • 3 years ago
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    yes

  54. juciystar234
    • 3 years ago
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    wait

  55. juciystar234
    • 3 years ago
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    yes

  56. asnaseer
    • 3 years ago
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    ok, sorry I originally interpreted it as:\((8- 6.2) \div (5 + 7(0.91))\)

  57. juciystar234
    • 3 years ago
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    ohhh ok

  58. asnaseer
    • 3 years ago
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    so lets start again - ok?

  59. juciystar234
    • 3 years ago
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    ok

  60. asnaseer
    • 3 years ago
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    \[8- 6.2 \div 5 + 7(0.91)\]first step - brackets to get:\[8- 6.2 \div 5 + 7(0.91)=8- 6.2 \div 5 + 7*0.91\]next is exponents/root but we have none next is multiplication/division - we have both, so you did 7*0.91 = 6.37\[8- 6.2 \div 5 + 6.37\]

  61. asnaseer
    • 3 years ago
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    thats how far we got

  62. asnaseer
    • 3 years ago
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    so next we should do what?

  63. juciystar234
    • 3 years ago
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    add?

  64. juciystar234
    • 3 years ago
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    or no subtract

  65. asnaseer
    • 3 years ago
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    nope - have a closer look at what is still left

  66. juciystar234
    • 3 years ago
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    like left to right but switch add with division

  67. asnaseer
    • 3 years ago
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    it should be division next

  68. juciystar234
    • 3 years ago
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    so divide?

  69. juciystar234
    • 3 years ago
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    ok

  70. asnaseer
    • 3 years ago
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    so what is 6.2 divided by 5 = ?

  71. juciystar234
    • 3 years ago
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    ok hold on

  72. asnaseer
    • 3 years ago
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    (a quick trick to divide by 5 is to divide by 10 and then halve the result)

  73. juciystar234
    • 3 years ago
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    |dw:1347581921786:dw|

  74. juciystar234
    • 3 years ago
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    sorry i was drawing :P

  75. asnaseer
    • 3 years ago
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    that is not correct

  76. juciystar234
    • 3 years ago
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    o.o

  77. juciystar234
    • 3 years ago
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    ok :) so now how do i do it ? :|

  78. asnaseer
    • 3 years ago
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    the /quick/ method or using long division like you attempted up there?

  79. juciystar234
    • 3 years ago
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    or like were did i mess up

  80. juciystar234
    • 3 years ago
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    um i guess....

  81. juciystar234
    • 3 years ago
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    go on

  82. asnaseer
    • 3 years ago
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    |dw:1347582167712:dw|

  83. juciystar234
    • 3 years ago
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    oh

  84. juciystar234
    • 3 years ago
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    i get it!!!

  85. juciystar234
    • 3 years ago
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    my decimal messed me up..

  86. asnaseer
    • 3 years ago
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    the other way is 6.2 divided by 10 is 0.62 double that is 0.62 + 0.62 = 1.24 (sorry I incorrectly stated you halve the result up there - it should be double the result after dividing by 10)

  87. juciystar234
    • 3 years ago
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    Hmmm ok

  88. asnaseer
    • 3 years ago
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    ok, so we now have:\[8- 6.2 \div 5 + 6.37=8-1.24+6.37\]

  89. asnaseer
    • 3 years ago
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    the rest should now be straight forward

  90. juciystar234
    • 3 years ago
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    so adding?

  91. asnaseer
    • 3 years ago
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    sure

  92. juciystar234
    • 3 years ago
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    ok

  93. asnaseer
    • 3 years ago
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    but be careful with the signs

  94. juciystar234
    • 3 years ago
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    I got this part let me draw it for you

  95. juciystar234
    • 3 years ago
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    |dw:1347582462471:dw|

  96. asnaseer
    • 3 years ago
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    remember the 1.24 has a minus sign next to it

  97. asnaseer
    • 3 years ago
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    so this is really "-1.24 + 6.37"

  98. juciystar234
    • 3 years ago
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    no thats not a negative its a minus

  99. asnaseer
    • 3 years ago
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    so it might be better to first do "8 - 1.24"

  100. juciystar234
    • 3 years ago
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    ok

  101. juciystar234
    • 3 years ago
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    6.76?

  102. juciystar234
    • 3 years ago
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    then add

  103. asnaseer
    • 3 years ago
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    think of it in this way:\[8- 6.2 \div 5 + 6.37=8-1.24+6.37=8+(-1.24)+6.37\]

  104. asnaseer
    • 3 years ago
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    yes add next

  105. juciystar234
    • 3 years ago
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    ok so 13.13

  106. asnaseer
    • 3 years ago
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    I was trying to explain why you had to do "-1.24 + 6.37" previously

  107. juciystar234
    • 3 years ago
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    Yaaa i got it my text book says that but i needed to work it out thank you!!!!!

  108. asnaseer
    • 3 years ago
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    yes - that is the correct answer

  109. juciystar234
    • 3 years ago
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    ok

  110. asnaseer
    • 3 years ago
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    yw :)

  111. juciystar234
    • 3 years ago
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    Thanks once again!! :D

  112. asnaseer
    • 3 years ago
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    np :)

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