Ex: Related Rates Problem -- Rate of Change of a Shadow from a Light Pole

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This video explains how to determine the rate of change of a shadow from a person walking away from a street light.
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I will make another video that shows how to find both how fast the tip is moving and how fast the length of the shadow is changing. Thanks for the suggestion.

Mathispoweru
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so in the end, ... what's that information x = 45 useful for? :)

hduongFGC
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How fast is the length of the shadow changing ? (Length = y-x)

JeanDAVID