Question

Help? Lighthouse A, located on an ocean shore, uses a 10-kW light. Lighthouse B uses a 20-kW light and is located 8 km out to sea from a point 6 km down the beach from Lighthouse A.

2. A man is walking down the beach away from lighthouse A and toward point C. When he is x kilometers away from lighthouse A and has not yet reached point C, write the illumination he receives as a function of x in simplest form.

Answer 1

okay im not uderstanding where point c is. is it the intersection at the ocean shore?

Answer 2

One sec.

Answer 3

okay give me a minute

Answer 4

Alright!

Answer 5

im sorry i dont think i can get this one
if someone else answers it i would like to know the answer

Answer 6

haha No problem. :) Thanks for trying!

Answer 7

@jim_thompson5910

Answer 8

@hartnn

Answer 9

@dumbcow @phi

Answer 10

@ganeshie8

Answer 11

you can measure the distance from point B using pythagorean thm
\[d = \sqrt{8^{2} + (6-x)^{2}} = \sqrt{x^{2}-12x+100}\]
is illumination measured by watts*distance ?
if so then function is
\[l = 10x+20\sqrt{x^{2}-12x+100}\]