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a 6' person is standing x feet away form a 10' lamppost. what is the distance d from the base of the lamppost to the end of the person's shadow, expressed as a function of x

  • math -

    Make a sketch and notice the similar triangles.

    by ratio:
    d/10 = (d-x)/6
    6d = 10d - 10x
    -4d = -10x
    d = (5/2)x

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