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swin2013 Group Title

Related Rates question?

  • one year ago
  • one year ago

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  1. swin2013 Group Title
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    At what rate is the area of the triangle formed by the ladder wall and the ground changing at that moment? i already know that dy/dt is -12 cm/sec

    • one year ago
  2. baldymcgee6 Group Title
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    Please give the whole question

    • one year ago
  3. swin2013 Group Title
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    A 13 ft ladder is leaning against a house when its base starts to slide away. By the time the base is 12 ft from the house, the base is moving at the rate 5 ft/sec

    • one year ago
  4. baldymcgee6 Group Title
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    |dw:1352178476520:dw|

    • one year ago
  5. swin2013 Group Title
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    yep, well i already found dy/dt and i was deriving dA/dt but it seemed wrong

    • one year ago
  6. swin2013 Group Title
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    i got 1/2 db/dt * h + dh/dt *b

    • one year ago
  7. baldymcgee6 Group Title
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    |dw:1352178791974:dw|

    • one year ago
  8. baldymcgee6 Group Title
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    |dw:1352179052193:dw|

    • one year ago
  9. swin2013 Group Title
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    close, the answer is =59.5....

    • one year ago
  10. swin2013 Group Title
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    how did you do that? did you just took the derivative inside and distribute the half sign?

    • one year ago
  11. baldymcgee6 Group Title
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    oops o missed something while differentiating the area formula

    • one year ago
  12. swin2013 Group Title
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    ok but did you do product rule?

    • one year ago
  13. baldymcgee6 Group Title
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    yes

    • one year ago
  14. baldymcgee6 Group Title
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    but wrong.. lol

    • one year ago
  15. baldymcgee6 Group Title
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    |dw:1352179446697:dw|

    • one year ago
  16. swin2013 Group Title
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    do you have to distribute?

    • one year ago
  17. baldymcgee6 Group Title
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    no theres nothing to distribute

    • one year ago
  18. swin2013 Group Title
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    then why do you have 0.5 multiplied on each portion? isn't 1/2 a constant?

    • one year ago
  19. baldymcgee6 Group Title
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    just type that into your calc... and you should get it.

    • one year ago
  20. baldymcgee6 Group Title
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    0.5 is a constant that could be factored out.. but there is no point

    • one year ago
  21. swin2013 Group Title
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    i did. but if i didn't distribute, i would get the wrong answer

    • one year ago
  22. swin2013 Group Title
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    oh no i got it/ lol nvm thanks!

    • one year ago
  23. baldymcgee6 Group Title
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    :)

    • one year ago
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