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14 April, 19:03

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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?

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  1. 14 April, 20:31
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    once you have that relation, then you can replace the variables by the numbers given. by similar triangles that relation is

    y12 = 2x then differentiate both sides
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