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anonymous

  • 5 years ago

A building cast a shadow of 12 feet. At the same time a 3 feet yard stick held vertically cast a shadow of 4.5 inches. How tall is the building?

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  1. anonymous
    • 5 years ago
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    Use ratios... height of object/length of shadow = height of other object/other length of it's shadow

  2. anonymous
    • 5 years ago
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    ok, but I do not understand

  3. anonymous
    • 5 years ago
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    Since you don't know height of building, let that be x.... so for building, ratio is x/12 for the other it would 3/4.5

  4. anonymous
    • 5 years ago
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    So I multiply now

  5. NY,NY
    • 5 years ago
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    ya so now cross multiply

  6. anonymous
    • 5 years ago
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    set those equal to each other and cross multiply

  7. anonymous
    • 5 years ago
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    I am lost

  8. NY,NY
    • 5 years ago
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    you've got your ratios set up?

  9. anonymous
    • 5 years ago
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    yes

  10. NY,NY
    • 5 years ago
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    ok so now cross multiply:

  11. anonymous
    • 5 years ago
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    4.5x=36

  12. NY,NY
    • 5 years ago
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    hold on

  13. anonymous
    • 5 years ago
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    ok

  14. anonymous
    • 5 years ago
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    yes

  15. anonymous
    • 5 years ago
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    then finish solving for x

  16. anonymous
    • 5 years ago
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    Divide by 4.5

  17. anonymous
    • 5 years ago
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    right

  18. anonymous
    • 5 years ago
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    ok give me a sec

  19. anonymous
    • 5 years ago
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    ok

  20. anonymous
    • 5 years ago
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    I got 8ft tall

  21. anonymous
    • 5 years ago
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    that's right!

  22. NY,NY
    • 5 years ago
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    well there you go!

  23. anonymous
    • 5 years ago
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    Thanks so much

  24. NY,NY
    • 5 years ago
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    welcome

  25. anonymous
    • 5 years ago
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    You're welcome :)

  26. NY,NY
    • 5 years ago
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    lol

  27. anonymous
    • 5 years ago
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    You are good

  28. NY,NY
    • 5 years ago
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    ty

  29. anonymous
    • 5 years ago
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    You like math

  30. NY,NY
    • 5 years ago
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    no i really dont

  31. anonymous
    • 5 years ago
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    I do Haha

  32. anonymous
    • 5 years ago
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    lol

  33. NY,NY
    • 5 years ago
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    hey you know anything bout radiation in Japan?

  34. anonymous
    • 5 years ago
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    Can you help me with 1 more?

  35. NY,NY
    • 5 years ago
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    sure

  36. anonymous
    • 5 years ago
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    Just from the news

  37. NY,NY
    • 5 years ago
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    its for my hw i need to know about the rafdiation stuff

  38. anonymous
    • 5 years ago
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    A map uses a scale of 1 centimeter for each 5 kilometer

  39. anonymous
    • 5 years ago
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    I can tell you what I have seen

  40. anonymous
    • 5 years ago
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    If the distance on a map from City A to city B is 17.5 cm

  41. anonymous
    • 5 years ago
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    what is the distance between the cities in kilometers

  42. anonymous
    • 5 years ago
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    and in miles

  43. NY,NY
    • 5 years ago
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    well i dont know about miles

  44. NY,NY
    • 5 years ago
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    but i can help you with the other thing

  45. anonymous
    • 5 years ago
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    There are 2.54 cm in 1 inch and 5280 ft in 1 mile

  46. anonymous
    • 5 years ago
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    ok, thanks

  47. NY,NY
    • 5 years ago
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    so you know that for eveery centimeter it is equal to 5 kilometers

  48. anonymous
    • 5 years ago
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    What do you need to know about the radiation?

  49. anonymous
    • 5 years ago
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    yes

  50. NY,NY
    • 5 years ago
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    w8 lemme help you with your stuff then you tell me radiation blah blah

  51. anonymous
    • 5 years ago
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    Use ratios again.... cm/km = cm/km or 1/5 = 17.5 cm/x

  52. anonymous
    • 5 years ago
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    ok

  53. anonymous
    • 5 years ago
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    then cross multiply

  54. NY,NY
    • 5 years ago
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    yup exactly what he/she said

  55. anonymous
    • 5 years ago
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    She :)

  56. NY,NY
    • 5 years ago
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    oh ok lol

  57. anonymous
    • 5 years ago
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    would 1/5 be over 1

  58. anonymous
    • 5 years ago
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    no, just leave it as 1/5

  59. anonymous
    • 5 years ago
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    How can it be cross multiplied?

  60. anonymous
    • 5 years ago
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    1 * x = 5 * 17.5

  61. NY,NY
    • 5 years ago
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    yea

  62. anonymous
    • 5 years ago
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    85

  63. anonymous
    • 5 years ago
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    I meant 87.5

  64. anonymous
    • 5 years ago
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    Yes, 87.5 km

  65. NY,NY
    • 5 years ago
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    lol 64 replies!!!!!!!!!!

  66. NY,NY
    • 5 years ago
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    65

  67. anonymous
    • 5 years ago
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    to this question

  68. anonymous
    • 5 years ago
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    Ha!

  69. anonymous
    • 5 years ago
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    Now to convert 87.5 km to miles?

  70. anonymous
    • 5 years ago
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    Convert km to cm, then cm to inches, inches to feet, and feet to miles

  71. anonymous
    • 5 years ago
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    I am not good with geometry

  72. anonymous
    • 5 years ago
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    there are 1000 meters in one km, so first multiply by 1000

  73. anonymous
    • 5 years ago
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    Will that -= the miles

  74. anonymous
    • 5 years ago
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    this means 87.5 km = 87,500 m..... then, there are 100 cm in a meter, so mulitply the above answer by 100 and you'll have the answer in centimeters

  75. anonymous
    • 5 years ago
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    so it's 8,750,000 cm

  76. anonymous
    • 5 years ago
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    we would g through all the steps to get to the miles, correct?

  77. anonymous
    • 5 years ago
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    yes, from cm, you would convert to get inches, then with inches you can get feet, and then feet to miles

  78. anonymous
    • 5 years ago
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    You have to be careful though. There are 2.54 cm in 1 inch, so this time you DIVIDE by 2.54

  79. anonymous
    • 5 years ago
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    ok

  80. anonymous
    • 5 years ago
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    36 inches in 1 ft, so DIVIDE by 36

  81. anonymous
    • 5 years ago
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    You would divide 8,750,000 by 36?

  82. anonymous
    • 5 years ago
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    no, divide by 2.54 first

  83. anonymous
    • 5 years ago
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    ok

  84. anonymous
    • 5 years ago
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    then that answer by 36

  85. anonymous
    • 5 years ago
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    95691 miles

  86. anonymous
    • 5 years ago
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    then last step, 5280 ft in a mile

  87. anonymous
    • 5 years ago
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    yes, but don't round the answer until you have divided by 5280

  88. anonymous
    • 5 years ago
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    and round answer to however many decimal places you need

  89. anonymous
    • 5 years ago
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    I got 18.12 miles

  90. anonymous
    • 5 years ago
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    Correct!

  91. anonymous
    • 5 years ago
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    Thanks

  92. anonymous
    • 5 years ago
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    Hmmmm, that doesn't sound right....let me double check my work :)

  93. anonymous
    • 5 years ago
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    NO, that IS right...I was thinking about something else...Sorry :)

  94. anonymous
    • 5 years ago
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    ok

  95. anonymous
    • 5 years ago
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    Haha, I'm confusing myself....let me check that

  96. anonymous
    • 5 years ago
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    I messed you up....so, sorry....there are 12 inches in a foot....OOPS

  97. anonymous
    • 5 years ago
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    we used 36.....sorry about that

  98. anonymous
    • 5 years ago
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    The radiation in Japan has traveled to some parts of the U.S, through the water. The amount that is in seafood, they say is small, but a lot of places has stopped selling things like fish.

  99. anonymous
    • 5 years ago
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    ok, how far do I go back?

  100. anonymous
    • 5 years ago
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    we worked it right, just used the wrong number there....i apologize. Go back to where we divided by 36....that should have been 12

  101. anonymous
    • 5 years ago
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    I am trying to scroll up

  102. NY,NY
    • 5 years ago
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    we're gonna make the world record for most replies on open study

  103. anonymous
    • 5 years ago
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    87.5 * 1000 * 100 ....then take that answer and divide by 2.54, then divide by 12, then divide by 5280

  104. anonymous
    • 5 years ago
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    Ok, doing that now, did you see my response abt the radiation?

  105. anonymous
    • 5 years ago
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    I got 54.37 miles

  106. anonymous
    • 5 years ago
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    Yes, that is correct....AND that answer makes sense LOL Sorry about the other. It's right now :)

  107. NY,NY
    • 5 years ago
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    oh i didnt notice that thank you!

  108. anonymous
    • 5 years ago
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    Thanks

  109. anonymous
    • 5 years ago
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    You're welcome...I'll let y'all chat about Japan now :)

  110. anonymous
    • 5 years ago
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    A lot of people has been diagnosed with radiation, and some are bad

  111. anonymous
    • 5 years ago
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    Thanks so much

  112. NY,NY
    • 5 years ago
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    hey you know where you got that info like what was the news channel?

  113. anonymous
    • 5 years ago
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    It was my local news.

  114. anonymous
    • 5 years ago
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    I bet you can get more information on-line

  115. anonymous
    • 5 years ago
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    maybe type in radiation in Japan

  116. NY,NY
    • 5 years ago
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    yea im on this BBC News website but i want to use the information you said but i have to name the source of information

  117. anonymous
    • 5 years ago
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    I know it is ABCnews.com

  118. anonymous
    • 5 years ago
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    I am checking to make sure it is correct

  119. anonymous
    • 5 years ago
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    I am here seeing if I can post the link

  120. NY,NY
    • 5 years ago
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    wait i got it

  121. anonymous
    • 5 years ago
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    Radiation found in Japan's food, water - Washington Times Mar 20, 2011 ... Fears of nuclear fallout grew during a wet Sunday after officials reported traces of radioactive elements in milk, spinach, water and rain ... http://www.washingtontimes.com/news/2011/mar/20/radiation-found-in-japans-food-water/

  122. NY,NY
    • 5 years ago
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    no waIT no

  123. anonymous
    • 5 years ago
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    ok, great

  124. anonymous
    • 5 years ago
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    Wait that one is not local

  125. NY,NY
    • 5 years ago
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    thank you

  126. anonymous
    • 5 years ago
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    that was nt about it being in the U.S. was it?

  127. NY,NY
    • 5 years ago
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    um no it's about radiation in thje food and water

  128. anonymous
    • 5 years ago
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    Darn, my page all scrambled, i am tying to clear it

  129. anonymous
    • 5 years ago
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    ok

  130. anonymous
    • 5 years ago
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    Japan Radiation: U.S. Seafood Test Fish at Los Angeles wholesaler tested for possible radiation leaked from Japan. Apr 07, 2011 07:42 AM Video from GMA ABC News

  131. anonymous
    • 5 years ago
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    Is that ok

  132. anonymous
    • 5 years ago
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    Hello

  133. NY,NY
    • 5 years ago
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    yes

  134. anonymous
    • 5 years ago
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    ok, great

  135. NY,NY
    • 5 years ago
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    ty

  136. anonymous
    • 5 years ago
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    Thanks for your help today and it was nice to meet you

  137. NY,NY
    • 5 years ago
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    you too

  138. NY,NY
    • 5 years ago
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    could you fan me?

  139. anonymous
    • 5 years ago
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    I do not know how to

  140. NY,NY
    • 5 years ago
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    it says become a fan next to my name

  141. anonymous
    • 5 years ago
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    Where, I do not see it

  142. NY,NY
    • 5 years ago
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    Where it says NY,NY it says star (11 fans next to that it says become a fan

  143. anonymous
    • 5 years ago
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    It does not say that on my screen

  144. anonymous
    • 5 years ago
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    I see everything except become a fan

  145. NY,NY
    • 5 years ago
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    but it should there is a thumbs up picture and nexto it it says Become a fan

  146. anonymous
    • 5 years ago
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    The thumbs up is not there

  147. anonymous
    • 5 years ago
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    Are you still here

  148. NY,NY
    • 5 years ago
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    yes sorry

  149. anonymous
    • 5 years ago
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    Thats ok, if I attache a file can you see it

  150. anonymous
    • 5 years ago
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    It has my homework on it and it is geometry, I am about to fail it and ned help

  151. anonymous
    • 5 years ago
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    need

  152. NY,NY
    • 5 years ago
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    um w8 im sorry im doing homework

  153. anonymous
    • 5 years ago
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    I am about to get back to my work as well. thanks for all your help

  154. NY,NY
    • 5 years ago
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    your very welcome

  155. NY,NY
    • 5 years ago
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    will you stay online ?

  156. NY,NY
    • 5 years ago
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    ltkrlkmh;kjdhjej kheeetj kjer;k;byet

  157. radar
    • 5 years ago
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    Did you consider inches vs feet for the original building? An 8 ft high building sounds kind of short!

  158. NY,NY
    • 5 years ago
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    uh radar, you do understand this question is from 6 DAYS AGO?????????

  159. radar
    • 5 years ago
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    NY,NY, I like to look at the problems and the answers for my own edification, I learn a lot that way. In the problem, the original problem, you were given that a building of unknown height cast a shadow of 12 ft. At the same a yard stick cast as shadow of 4.5 inches. The solution that you and your help worked out was the building was 8 ft tall. Kinda short don't you think. It was agreed that this was a ratio problem and one of the proportion was x/12 which I find agreeable. The other proportion 3/4.5 Huh??? That was the flaw . The units are ft vs in, while it should be 36/4.5 as the 4.5 is in inches. x/12::36/4.5 Gives a height of 96 ft. Do you agree?

  160. NY,NY
    • 5 years ago
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    hmmm ya i didnt notice 8 ft didnt sound right maybe you are correct? well any way its a good thing cdunn didnt fan me cuz i could have been wrong!

  161. NY,NY
    • 5 years ago
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    but if it is feet to inches then isnt it 3 ft: 4.5 in? where does 36 come from?

  162. radar
    • 5 years ago
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    3 ft is 3 *12 = 36 in.

  163. radar
    • 5 years ago
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    The 3 ft yardstick cast a shadow of 4.5 inches.

  164. anonymous
    • 5 years ago
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    Radar, you are correct. I completely overlooked that when I was working that problem.

  165. NY,NY
    • 5 years ago
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    oh! lol

  166. radar
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    Math93, I just fanned you, you're a good sport, I realize this was a old problem, but old enough that we couldn't learn from it.

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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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