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anonymous

  • one year ago

Did I do this right? SA= 2(3 ½ + 11 ½ ) + 2(11 ½ + 11 ¾ ) + 2(3 ½ + 11 ¾ ) SA = 2(30) + 2(46.5) + 2(30.5) SA= 60 + 93 + 61 SA= 214

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  1. anonymous
    • one year ago
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    It looks like you already multiplied everything by two in the second step and put it in parenthesis. So, the additional 2 outside would not be needed at this point.

  2. anonymous
    • one year ago
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    SA = 2(15) + 2(23.25) + 2(15.25) should be what you have in step 2.

  3. anonymous
    • one year ago
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    |dw:1440632662356:dw|

  4. anonymous
    • one year ago
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    Basically step 2 should be SA = 2(15) + 2(23.25) + 2(15.25).

  5. anonymous
    • one year ago
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    oh ok

  6. anonymous
    • one year ago
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    So all i have to do is do SA = 2(15) + 2(23.25) + 2(15.25) and get my answer?

  7. anonymous
    • one year ago
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    It looked like you accidentally multiplied by 2 going to that step and didn't realize it. Otherwise it would be (30) + (46.5) + (30.5). But that would require two steps.

  8. anonymous
    • one year ago
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    correct

  9. anonymous
    • one year ago
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    ok let me see what i get

  10. anonymous
    • one year ago
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    ok 107?

  11. anonymous
    • one year ago
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    That is correct. Also there is another way you could have done it which would give the same answer. Since everything is multiplied by 2, you can separate it and add everything else together.

  12. anonymous
    • one year ago
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    yea i think i would have liked it better that way

  13. anonymous
    • one year ago
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    SA= 2(3 ½ + 11 ½ ) + 2(11 ½ + 11 ¾ ) + 2(3 ½ + 11 ¾ ) SA = 2(3 ½ + 11 ½ + 11 ½ + 11 ¾ + 3 ½ + 11 ¾ ) SA= 2(53 ½) SA= 107

  14. anonymous
    • one year ago
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    i have another question can you just explain it to me what it means?

  15. anonymous
    • one year ago
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    4. What is the surface area of the box if it is scaled up by a factor of 10? its with the same question i asked before

  16. anonymous
    • one year ago
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    I dont know what it wants me to do

  17. anonymous
    • one year ago
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    Scaling something by a factor essentially means multiplying everything in the equation by that factor.

  18. anonymous
    • one year ago
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    Since your factor is 10, you would simply multiply the Surface Area you already have by that factor (10).

  19. anonymous
    • one year ago
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    so 107/10?

  20. anonymous
    • one year ago
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    107 * 10

  21. anonymous
    • one year ago
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    Out of curiosity, what was the original question that brought you to your work that you originally asked about?

  22. anonymous
    • one year ago
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    1,070 right?

  23. anonymous
    • one year ago
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    1. List the dimensions of your box. Be sure to include the units (in, cm, ft., etc.). 2. Describe the shape of the cross section when the box is cut parallel to the base. 3. What is the surface area of the box? 4. What is the surface area of the box if it is scaled up by a factor of 10? 5. What is the volume of the box? 6. What is the volume of the box if it is scaled down by a factor of ½?

  24. anonymous
    • one year ago
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    OK, we need to back up to your original question as you set up the formula wrong.

  25. anonymous
    • one year ago
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    ok ok #work lol

  26. anonymous
    • one year ago
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    hehe, it happens. Did you have to pick an item to measure or was dimensions already give to you?

  27. anonymous
    • one year ago
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    i had to pick it

  28. anonymous
    • one year ago
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    i just chose a binder

  29. anonymous
    • one year ago
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    The formula for SA is 2 ( lw + lh + hw) or 2(lw) + 2(lh) + 2(hw) where the letters besides each other mean to multiply, not add.

  30. anonymous
    • one year ago
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    Sorry, I didn't think about your equation when you asked, was just making sure the math was correct.

  31. anonymous
    • one year ago
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    So, you would be multiply fractions by using those measurements.

  32. anonymous
    • one year ago
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    Would you like to try something different or keep with the binder?

  33. anonymous
    • one year ago
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    um i already have the measurements so keep it lol

  34. anonymous
    • one year ago
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    Ok, so now you would have SA= 2(3 ½ * 11 ½ ) + 2(11 ½ * 11 ¾ ) + 2(3 ½ * 11 ¾ )

  35. anonymous
    • one year ago
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    135.125?

  36. anonymous
    • one year ago
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    SA= 2(3 ½ * 11 ½ ) + 2(11 ½ * 11 ¾ ) + 2(3 ½ * 11 ¾ ) SA= 2(40.25 ) + 2(135.125 ) + 2(41.125 )

  37. anonymous
    • one year ago
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    sorry, this place is annoying with fractions. .125 would be 1/8

  38. anonymous
    • one year ago
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    433!

  39. anonymous
    • one year ago
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    correct

  40. anonymous
    • one year ago
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    yes!!

  41. anonymous
    • one year ago
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    Now, since we are dealing with multiplying in our original equation instead of adding it changes the factor question somewhat.

  42. anonymous
    • one year ago
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    how would it be different?

  43. anonymous
    • one year ago
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    It is like saying SA = 2(10l * 10w) + 2(10l * 10h) + 2(10w * 10h)

  44. anonymous
    • one year ago
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    essentially you are multiplying all of your measurements by 10 and changing the equation to those new measurements.

  45. anonymous
    • one year ago
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    Since what really changes is you add are now multiplying by 10 * 10. So instead of 10 you would multiply your final answer by 100 instead. This part is simply a shortcut and if you are required to show your work you may have to multiply each measurement by 10 and redo the work.

  46. anonymous
    • one year ago
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    SA= 2(35 + 115 ) + 2(115 + 117.5 ) + 2(35 + 117.5 )

  47. anonymous
    • one year ago
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    This would be your new formula if you multiplied each side by 10.

  48. anonymous
    • one year ago
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    oops, i made a mistake on that last formula, ignore it.

  49. anonymous
    • one year ago
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    SA= 2(35 * 115 ) + 2(115 * 117.5 ) + 2(35 * 117.5 )

  50. anonymous
    • one year ago
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    i was confused too lol ok

  51. anonymous
    • one year ago
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    There, fixed. sorry, was trying to copy and paste to save time and messed up. Will be extra careful from now on.

  52. anonymous
    • one year ago
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    i got a crazy number...

  53. anonymous
    • one year ago
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    13512.5??

  54. anonymous
    • one year ago
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    Should have got 43300

  55. anonymous
    • one year ago
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    hmm let me check my work

  56. anonymous
    • one year ago
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    ok yep now i got 43300

  57. anonymous
    • one year ago
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    multiplied wrong

  58. anonymous
    • one year ago
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    SA= 2(35 * 115 ) + 2(115 * 117.5 ) + 2(35 * 117.5 ) SA= 2(4025 ) + 2(13512.5 ) + 2(4112.5) SA = 8050 + 27025 + 8225 SA = 43300

  59. anonymous
    • one year ago
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    ok, awesome

  60. anonymous
    • one year ago
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    The biggest thing in math is to learn your formulas. As long as you start with the right formula, chances are you will do really well.

  61. anonymous
    • one year ago
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    There are so many though.

  62. anonymous
    • one year ago
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    I memorize most of them but i have trouble with long ones

  63. anonymous
    • one year ago
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    Usually math teachers will give you a sheet with the formulas when you take tests so it is generally ok to use one when doing homework.

  64. anonymous
    • one year ago
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    true lol

  65. anonymous
    • one year ago
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    Don't worry, I think we all have that problem. Trying to remember all of the formulas can be tough. It doesn't hurt to try and set up your work from memory but before you actually start doing it, go back and make sure you had the formula right.

  66. anonymous
    • one year ago
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    The volume of a rectangular prism is V=bh right? i think im wrongl ol

  67. anonymous
    • one year ago
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    Also, I find it helpful to right down the formula before starting the work.

  68. anonymous
    • one year ago
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    Volume is in three dimensions so you would have a third measurement there. V = lhw

  69. anonymous
    • one year ago
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    oh ok so it would be.... V= 11 3/4 x 11 1/2 x 3 1/2

  70. anonymous
    • one year ago
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    right

  71. anonymous
    • one year ago
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    ok so the answer to that is....

  72. anonymous
    • one year ago
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    (doing the work lol)

  73. anonymous
    • one year ago
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    LOL, see why i asked if you wanted to measure something else. :) Ask your teacher if it is okay to round up for future reference that way you aren't haven't to spend so much time on one problem.

  74. anonymous
    • one year ago
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    472.938??

  75. anonymous
    • one year ago
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    i will thx lol :)

  76. anonymous
    • one year ago
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    Yes, basically.

  77. anonymous
    • one year ago
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    Ok, what do you think it means to scale the box down by 1/2?

  78. anonymous
    • one year ago
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    Subtract by 1/2 i guess?

  79. anonymous
    • one year ago
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    Not quite. like I said before, a factor is a number you multiply by. So, you would multiply each of your sides by 1/2. Or, in other words, half of your original measurements.

  80. anonymous
    • one year ago
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    OHhhhhhhh!

  81. anonymous
    • one year ago
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    so half of 3.5, half of 11.5, and half of 11.75

  82. anonymous
    • one year ago
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    ok that would beeee....

  83. anonymous
    • one year ago
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    Hope you are ok with me doing decimals, should have asked I know your original measurements are in fractions. That doesn't confuse you, does it?

  84. anonymous
    • one year ago
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    Not really i mean its the same thing

  85. anonymous
    • one year ago
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    That is great that you can see that they are the same right away. That means you are doing really good in math :)

  86. anonymous
    • one year ago
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    I guess lol im a 7th grader but i have 9th grade class. Algebra Honors

  87. anonymous
    • one year ago
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    That doesnt mean i dont need help though lol. 1.75 5.75 5.875?

  88. anonymous
    • one year ago
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    Correct, so do your Volume calculations with those new numbers and you will be good to go. And, you are right. We all need help sometimes.

  89. anonymous
    • one year ago
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    ok ok the volume will be...

  90. anonymous
    • one year ago
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    Eh idk about this answer V= 59.1171875

  91. anonymous
    • one year ago
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    That is very close to exact. If I was you, I would just round that to 59. Also, you could probably round the last answer to 473.

  92. anonymous
    • one year ago
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    Ok that would make more sense than to put the whole thing

  93. anonymous
    • one year ago
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    Thank you so much for your time

  94. anonymous
    • one year ago
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    Np, glad I could help.

  95. anonymous
    • one year ago
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    I honestly do really appreciate it! :)

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