Algebra

A 6-foot spruce tree is planted 15 feet from a lighted streetlight whose lamp is 18 feet above the ground. How many feet long is the shadow of that tree?

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  1. The answer would be 7.5 :-)

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  2. could you tell me how you got that answer?

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  3. 6/x = 18/(15+x)
    6(15+x) = 18x
    90+6x = 18x
    12x = 90
    x = 7.5

    Does this help? :-)

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  4. yes! thank you! I have another but I don't know how to put the picture into one of these boxes :)It's suppose to be a big triangle... In the figure below, the lengths of DE, EF, and FG are given, in units. What is the area, in square units, of triangle DEG?
    G
    / /|
    / / |
    / / |
    / / |10
    / / |
    /______/_____|
    D 12 7 F

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