A street light is mounted at the top of a 14 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 6 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 45 ft from the base of the pole?

use similar triangles. create two similar triangles based on the information tehn take the derivative

i dont understand how to do that

check out this website and go to example 2, it has a similar question with different numbers =) http://www.math.wfu.edu/tutorials/Math111/RelatedRates.pdf

okay carra i will solve it, im done with my hw

For the answer try 9/2 (ft/sec) , let me know whether it is correct. If it is, I will post the solution.

no not the answer

try 4.5

no

k let me see if i did anythinig wrong, brb

can you double check the question?

question is correct

okay, let me check my work again

can you try 4/3 or 1.3

no i sorry

hey

im on the case

do you mind, i will use twiddla

click on that

Okay so cantorset, this is what im doing: y/6 = (y+x)/14 => look at that in terms of similar triangles. Cross multiply and simplify: 14y = 6x + 6y 14(dy/dt)=6(dx/dt) + 6(dy/dt) 8 d(y/dt) = 6 (dx/dt) 8(dy/dt) = 6 * 6 8(dy/dt) = 36, solve for dy/dt = 9/2. What am I doing wrong?

its a whiteboard

carra try 10.5

uploading the screen

http://i53.tinypic.com/o6i8b7.jpg there's the screen

i gtg now, bbl

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