# 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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