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anonymous

  • 5 years ago

A street light is mounted at the top of a 14 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 6 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 45 ft from the base of the pole?

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  1. anonymous
    • 5 years ago
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    use similar triangles. create two similar triangles based on the information tehn take the derivative

  2. anonymous
    • 5 years ago
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    i dont understand how to do that

  3. anonymous
    • 5 years ago
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    check out this website and go to example 2, it has a similar question with different numbers =) http://www.math.wfu.edu/tutorials/Math111/RelatedRates.pdf

  4. bahrom7893
    • 5 years ago
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    okay carra i will solve it, im done with my hw

  5. bahrom7893
    • 5 years ago
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    For the answer try 9/2 (ft/sec) , let me know whether it is correct. If it is, I will post the solution.

  6. anonymous
    • 5 years ago
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    no not the answer

  7. bahrom7893
    • 5 years ago
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    try 4.5

  8. anonymous
    • 5 years ago
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    no

  9. bahrom7893
    • 5 years ago
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    k let me see if i did anythinig wrong, brb

  10. bahrom7893
    • 5 years ago
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    can you double check the question?

  11. anonymous
    • 5 years ago
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    question is correct

  12. bahrom7893
    • 5 years ago
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    okay, let me check my work again

  13. bahrom7893
    • 5 years ago
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    can you try 4/3 or 1.3

  14. anonymous
    • 5 years ago
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    no i sorry

  15. anonymous
    • 5 years ago
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    hey

  16. anonymous
    • 5 years ago
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    im on the case

  17. anonymous
    • 5 years ago
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    do you mind, i will use twiddla

  18. anonymous
    • 5 years ago
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    http://www.twiddla.com/492533

  19. anonymous
    • 5 years ago
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    click on that

  20. bahrom7893
    • 5 years ago
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    Okay so cantorset, this is what im doing: y/6 = (y+x)/14 => look at that in terms of similar triangles. Cross multiply and simplify: 14y = 6x + 6y 14(dy/dt)=6(dx/dt) + 6(dy/dt) 8 d(y/dt) = 6 (dx/dt) 8(dy/dt) = 6 * 6 8(dy/dt) = 36, solve for dy/dt = 9/2. What am I doing wrong?

  21. anonymous
    • 5 years ago
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    its a whiteboard

  22. bahrom7893
    • 5 years ago
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    carra try 10.5

  23. bahrom7893
    • 5 years ago
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    uploading the screen

  24. bahrom7893
    • 5 years ago
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    http://i53.tinypic.com/o6i8b7.jpg there's the screen

  25. bahrom7893
    • 5 years ago
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    i gtg now, bbl

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