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swin2013

  • 2 years ago

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  1. swin2013
    • 2 years ago
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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

  2. baldymcgee6
    • 2 years ago
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    Please give the whole question

  3. swin2013
    • 2 years ago
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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

  4. baldymcgee6
    • 2 years ago
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    |dw:1352178476520:dw|

  5. swin2013
    • 2 years ago
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    yep, well i already found dy/dt and i was deriving dA/dt but it seemed wrong

  6. swin2013
    • 2 years ago
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    i got 1/2 db/dt * h + dh/dt *b

  7. baldymcgee6
    • 2 years ago
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    |dw:1352178791974:dw|

  8. baldymcgee6
    • 2 years ago
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    |dw:1352179052193:dw|

  9. swin2013
    • 2 years ago
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    close, the answer is =59.5....

  10. swin2013
    • 2 years ago
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    how did you do that? did you just took the derivative inside and distribute the half sign?

  11. baldymcgee6
    • 2 years ago
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    oops o missed something while differentiating the area formula

  12. swin2013
    • 2 years ago
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    ok but did you do product rule?

  13. baldymcgee6
    • 2 years ago
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    yes

  14. baldymcgee6
    • 2 years ago
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    but wrong.. lol

  15. baldymcgee6
    • 2 years ago
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    |dw:1352179446697:dw|

  16. swin2013
    • 2 years ago
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    do you have to distribute?

  17. baldymcgee6
    • 2 years ago
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    no theres nothing to distribute

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

  19. baldymcgee6
    • 2 years ago
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    just type that into your calc... and you should get it.

  20. baldymcgee6
    • 2 years ago
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    0.5 is a constant that could be factored out.. but there is no point

  21. swin2013
    • 2 years ago
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    i did. but if i didn't distribute, i would get the wrong answer

  22. swin2013
    • 2 years ago
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    oh no i got it/ lol nvm thanks!

  23. baldymcgee6
    • 2 years ago
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    :)

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