## rarnold14 Group Title A man 6 feet tall walks at a rate of 13 feet per second away from a light that is 15 feet above the ground. When he is 8 feet from the base of the light, at what rate is the tip of his shadow moving? 2 years ago 2 years ago

1. giggles123

HINT HINT: Use similar Triangles!

2. jithinm

yup..gigles is right

3. satellite73

another hint. the rate of change will be a constant, the "when he is 8 feet" will have nothing to do with it.

4. satellite73

|dw:1320959290284:dw| use $\frac{x}{6}=\frac{x+y}{15}$ to get a relation between x and y. you know $y'=13$ and you want $x'$