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rarnold14

  • 3 years ago

A man 6 feet tall walks at a rate of 13 feet per second away from a light that is 15 feet above the ground. When he is 8 feet from the base of the light, at what rate is the tip of his shadow moving?

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  1. giggles123
    • 3 years ago
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    HINT HINT: Use similar Triangles!

  2. jithinm
    • 3 years ago
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    yup..gigles is right

  3. satellite73
    • 3 years ago
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    another hint. the rate of change will be a constant, the "when he is 8 feet" will have nothing to do with it.

  4. satellite73
    • 3 years ago
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    |dw:1320959290284:dw| use \[\frac{x}{6}=\frac{x+y}{15}\] to get a relation between x and y. you know \[y'=13\] and you want \[x'\]

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