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December 22, 2014

Homework Help: Calculus

Posted by Katie on Sunday, February 6, 2011 at 6:12pm.

A street light is hung 18 ft. above street level. A 6-foot tall man standing directly under the light walks away at a rate of 3 ft/sec. How fast is the tip of the man's shadow moving?

I know I would've to set up a proportion.

18 / 6 = x + y / y

x = distance of man from light
y = length of shadow
x + y = tip of shadow

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