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Mathematics 8 Online
OpenStudy (anonymous):

Related Rates A spotlight on the ground shines on a wall 12 m away. If a man 2 m tall walks from the spotlight toward the building at a speed of 2.1 m/s, how fast is the length of his shadow on the building decreasing when he is 4 m from the building? I cant figure out what db/dm is. b(building) m(man). I can solve it once I get that.

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